Human Blood Cells Under Microscope High Magnified Smear Of Red. Medscape Hematology. Available online at http://www.nejm.org/doi/pdf/10.1056/NEJMra043442. Body anatomy. Accessed February 2011. A phlebotomist, a person specifically trained to draw blood, first cleans and sterilizes the injection site with an antiseptic. Elstrom, R. (2001 October 28, Reviewed). The drop of blood on the slide used for a blood smear contains millions of RBCs, thousands of WBCs, and hundreds of thousands of platelets. Neutropenia. Traditionally, blood smear review/interpretation has been done manually using a microscope, which is time-consuming. of collection) Preparation of Blood Film: The slide should be clean. Purpose and Criteria for Blood Smear Scan, Blood Smear Examination, and Blood Smear Review. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003657.htm. Then look at the blood of several different animals, recording information about each. (September 9, 2009) Harper J. Pediatric Megaloblastic Anemia. Red blood cells have a characteristic pink appearance due to their high content of hemoglobin. Accessed on 6/02/18. Blood smear. what to look for. Robert Wood Johnson University Hospital, Medical Encyclopedia [On-line information]. Accessed July 2014. Medscape Drugs and Diseases [On-line information]. Observe the human blood under the microscope. (2005 August 4). Some of these include:1 1. to further evaluate abnormalities found on a complete blood count (CBC) such as a high or low red blood cell count, white blood cell count, or platele… The results of a blood smear typically include a description of the appearance of the red blood cells, white blood cells, and platelets as well as any abnormalities that may be seen on the slide. Accessed on 6/02/18. Under the microscope footage of a smear of frog blood. other cells. A blood smear is often used as a follow-up test to abnormal results on a complete blood count (CBC) to evaluate the different types of blood cells. They are anucleate, non-granulated, eosinophilic cells that are uniform in shape (biconcave discs) and size (7.2 microns). Many of the white There are two major types of lymphocytes, B cell and T cell, but they cannot be distinguished when viewed under the microscope using standard staining techniques. Available online at https://emedicine.medscape.com/article/204821-workup#c11. Normally only about 1-4% of WBCs in the blood are eosinophils. Rendered Tomograms Of Various Biological Cells A Red Blood Cell. Malaria is usually only seen in travelers returning from areas where the parasite is more common (endemic). The main function of monocytes is to ingest microbes and respond to infection and inflammation by releasing certain proteins (monokines) that can inactivate bacteria. Place a small drop of blood, or one side about 1-2 cm from one end. Genzen, J. and Lehman, C. (2018 May, Updated). They appear as biconcave discs of uniform shape and size (7.2 microns) that lack organelles and granules. Usually, only normal, mature or nearly mature cells are released into the bloodstream, but certain circumstances can induce the bone marrow to release immature and/or abnormal cells into the circulation. Blackwell, S. and Hendrix, P. (2001). Blood smear analysis allows quantitation of the different types of leukocytes (called the differential count), estimation of the platelet count, and detection of morphologic abnormalities that may be indicators of pathophysiologic processes. Unstained, the different types of leukocytes arealmost impossible to identify. N Engl J Med 2005; 353:498-507. B cells can be differentiated from T cells using specific fluorescent-labeled antibody stains in conjunction with a special instrument called a flow cytometer. White blood cells have a nucleus surrounded by cytoplasm. Accessed on 6/02/18. When stimulated by cytokines, monocytes can move out of the blood and become tissue macrophages. Available online at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4415389/. © 2021 Laboratory Corporation of America® Holdings. Can you find the white blood cell Human Blood Smear 4. A blood smear is a snapshot of the cells that are present in the blood at the time the sample is obtained. Blood cells are in three functional classes: red blood cells (erythrocytes), white blood … 2017 Oct-Dec; 39(4): 306–317. Macro photo. Cell fragments and platelet clumps, particularly if they are large in size, can be mistakenly counted as WBCs, thus falsely elevating a white cell count. to each other (sort of like when you twist one of those long Accessed July 2014. The nucleus of most lymphocytes is smooth in appearance and is dark blue. Walk-ins are also welcome. Accessed July 2014. But it does have the advantage It also determines the five different types of WBCs and their relative percentages (manual, Evaluates the size, shape, and color (indicators of hemoglobin content) of the RBCs (RBC morphology), Estimates the number of platelets present, Excessive bleeding episodes, easy bruising, or frequent nose bleeds, Hemoglobin variants including sickle cell anemia and thalassemia, Myeloproliferative or myelodysplastic neoplasms. 2013 Jan; 33(1): 1–7. Pagana, K. D. & Pagana, T. J. We are not interested in plasma in this lesson, only in the cells, both white and red blood cells. Basophils (10-15 µm) have large, purple-black granules and are the least often seen type of WBC (1%). A blood sample can be observed under a microscope to check the number of cells present in a particular concentration. B cells create specific antibodies while T cells can activate B cells as well as recognize and destroy invading organisms. Picture of Human blood cells under microscope. The leukocyte on the left You can even see platelets if you know what an unacceptable smear looks like! Saunders Elsievier: Philadelphia. If blasts are seen on a blood smear, they may indicate a serious bone marrow disease. Red Blood Cells (RBCs) Examples include anemia, myeloproliferative neoplasms, bone marrow disorders, and leukemia. Details on Red Blood Cell Irregularities (RBC morphology), American Society of Hematology: Blood Diseases Information, Combatting Modern Slavery and Human Trafficking Statement, White blood cells (WBCs, leukocytes) — help fight infections or participate in immune responses, Red blood cells (RBCs, erythrocytes) — carry oxygen to tissues, Platelets (thrombocytes) — small cell fragments that are vital to proper blood clotting, Compares the WBCs' size, shape, and general appearance to the established appearance of "normal" cells. Lynch, E. (© 1990) Chapter 155 Peripheral Blood Smear. Chances are 6:1 that the you find an eosinophil before you Image 103519039. The cytoplasm of neutrophils is pale and often contains small pink to purple granules. Leukemia, myelodysplastic syndrome or myeloproliferative neoplasm — immature white blood cells such as blasts may be seen on the blood smear; blasts are normally found in the bone marrow where WBCs are produced and mature before being released into the blood. One type of lymphocyte, the B-cell, is responsible for the production of antibodies (immunoglobulins). Gauer, R. and Braun, M. (2012 May 15). Ann Ib Postgrad Med. The blood smear is primarily ordered as a follow-up test when a CBC with differential, performed with an automated blood cell counter, indicates the presence of atypical, abnormal, or immature cells. Anemia in Elderly Persons. This allows the cells in this area to be individually counted and evaluated under the microscope. This occurs when there is … The red blood cells in this image Most of the cells you see here are erythrocytes or red blood A blood smear is a drop of blood spread thinly onto a glass slide that is then treated with a special stain and the blood cells on the slide are examined and evaluated. Body fluid in humans. (2012 May 18). The leukocyte on the (2001 October 15 ). Human blood smear with abnormal red blood cells morphology call stomatocyte and white blood cell call basophils under 100x light microscope. The blood smear is stained with Wright's stain, allowing students to easily distinguish between red and white blood cells. Accessed July 2014. Available online at http://emedicine.medscape.com/article/201066-overview. Blood. Available online at http://www.aafp.org/afp/2012/0315/p612.html. Medscape Reference [On-line information]. The Carolina Pledge: 100% Satisfaction Guaranteed. Hemolytic Anemia. Medical College of Virginia, Virginia Commonwealth University. 2. stock photo, images and stock photography. Available online at http://emedicine.medscape.com/article/959918-overview. Accessed July 2014. All Rights Reserved. 2. Merck Manual for Healthcare Professionals [On-line information]. Blood smear, human 5. blood-smear 6. blood-smear 7. blood-smear 8. granulocytes 9. Blood smear. They are characterized by their abundant blue-grey cytoplasm that is irregular in shape and have a folded nucleus. If there are too few, or if they don't function properly, the ability to form a clot becomes impaired and can be a life-threatening situation. Only about 1% of WBCs are basophils. Available online at http://www.merck.com/mrkshared/mmanual_home/sec14/152.jsp. Findings from a blood smear evaluation are not always diagnostic in themselves and more often indicate the possibility or presence of an underlying condition, its severity, and the need for further diagnostic testing. Labcorp's test menu provides a comprehensive list of specialty and general laboratory testing services. Blood counts and morphology can also be affected during times of illness or stress, and after transfusion. Label the power you drew cells with and following on the blood smear drawing: Red blood cells White blood cells Platelets Power _____ Accessed July 2014. Two examples include: See the section below for Details on Red Blood Cell Irregularities. Its nucleus has two segments. The blood smear allows for the evaluation of these cells: These cell populations are produced and mainly mature in the bone marrow and are eventually released into the bloodstream as needed. All WBCs are derived from bone marrow stem cells. For example, RBCs that appear smaller and paler than normal may support other results that indicate a type of anemia. I did this by lowering the condenser lens and closing the iris diaphragm to match the 0.65 numerical aperture of the 40X objective I was using. The cytoplasm is pale blue and normally only a small proportion of lymphocytes has any granules. Abbott, Pp 1-27. A laboratorian can see these abnormalities on a blood smear and has been trained to identify and classify them appropriately. 400x Abstract biologic red blood cells under microscope White blood cells are the cells of the immune system under the microscope in laboratories. Mosby's Diagnostic and Laboratory Test Reference 10th Edition: Mosby, Inc., Saint Louis, MO. neutrophil* lymphocyte* Monocyte. (© 2011). These granules (specific granules and azurophilic granules) contain certain enzymes and proteins that neutralize or destroy microbes. This type of WBC may be seen in greater numbers during infections, malignancies, or extreme stress situations. Preparation of Blood Smear: Collection of Sample: 1. They can also be seen in other scenarios, such as when the bone marrow is recovering or regenerating from chemotherapy, or, as another example, stimulated by a medication prior to stem cell collection. When the appearance of RBCs (RBC morphology) is normal, it is often reported as normochromic (normal color) and normocytic (normal size). Accessed February 2011. Give your students an up-close look at human blood cells using Carolina's most popular prepared blood microscope slide. White Blood Cells (WBCs) Bands are immature neutrophils with a U-shaped nucleus. A blood smear is often used to categorize and/or identify conditions that affect one or more type of blood cells and to monitor individuals undergoing treatment for these conditions. https://www.austincc.edu › histologyhelp › tissues › tt_blood.html NEUTROPHILS (also called segmented neutrophils, segs, polymorphonuclear cells, polys, or PMNs) are about 12 microns in diameter and their function is to engulf and destroy invading organisms. [On-line information]. Bell A, Sallah S. The Morphology of Human Blood Cells, 7th ed. Blood Smear, human - Leishman stain Eosinophils and basophils are the only cell types present in normal blood which initiallymay be difficult to distinguish - in particular in darker smears. Under-staining of the specimen. Finger Prick or . To evaluate your red blood cells (RBCs), white blood cells (WBCs), and platelets, to distinguish between the different types of WBCs, and to determine their relative percentages in the blood; to help detect, diagnose, and/or monitor a range of deficiencies, diseases, and disorders involving blood cell production, function, and lifespan, When complete blood count (CBC) and/or automated WBC differential results are abnormal or when you have signs and symptoms that a healthcare practitioner suspects are due to a condition affecting your blood cells, A blood sample drawn from a vein in your arm or by pricking a finger or, in the case of an infant, a heelstick. Available online at http://www.pathology.vcu.edu/education/PathLab/pages/hematopath/pbs.html. can see individual cells and tell the difference between red Available online at https://www.nejm.org/doi/full/10.1056/NEJMra043442. Those with granules in their cytoplasm are also called granulocytes (they are of myeloid lineage) and include: Numerous diseases and conditions can affect the absolute or relative number of WBCs and their appearance on a blood smear. The Merck Manual Home Edition [On-line information]. Eosinophils have two or three lobes to their nucleus and contain characteristic reddish/orange granules in their cytoplasm. HUMAN BLOOD SMEAR 1. Stained with Wright's blood stain. Common Anemias: What Lies Beneath. images. Peripheral smear. A specific technique is used to spread the drop of blood out across a glass slide into a "thumbprint" shape. Aim of creating a specimen: Making a human blood smear, staining the sample and naming the various blood cells. Share this post. Under the microscope footage of a smear of frog blood. Depending on the findings from the CBC and blood smear and the condition that your healthcare practitioner suspects, follow-up testing may include tests such as: It has on a routine basis, but the automated blood cell counter usually evaluates the red blood cells (RBCs), white blood cells (WBCs), and platelets based on their shape, size, and electrical or photometric properties. in this image? Examination of the blood smear can be used to support findings from other tests and examinations. Infections and/or inflammation — can increase certain types of WBCs, Bone marrow disorders — depending on the condition, may increase or decrease absolute and relative numbers of WBCs, Allergies — may affect the number of eosinophils. but you can see them in the image below. of including two kinds of white blood cell that are different Human Blood Smear Showing RedBlood Cells or Erythrocytes and White Blood . Available online at http://emedicine.medscape.com/article/2085133-overview#showall. ... Human Blood Smear With Abnormal Red Blood Cells Morphology Call. An abnormally low number or high number of platelets may be further evaluated by preparing a blood smear to directly visualize any anomalies in shape or size. Curry, C. (Updated 2012 August 1). Use of an automated instrument can often identify the presence of abnormal cells but lacks the ability to definitively subclassify them. Pagana, Kathleen D. & Pagana, Timothy J. Eosinophils have two or three lobes to their nucleus and contain characteristic … (© 1995–2014). Riley R, et.al. They are thin Henry's Clinical Diagnosis and Management by Laboratory Methods. E.D.T.A. They are most often involved in allergic responses and parasitic infections. In the bone marrow, they differentiate into two groups: myeloid and lymphoid cells. These are cell fragments that develop from large bone marrow cells called megakaryocytes. so dark that you can't see the nucleus. You will look at various prepared slides including Paramecium, Spirogyra, Human Blood Smears, Human Sickle Cell Red Blood Smears, Frog Blood Smears, and possibly others. 2017 Oct-Dec; 39(4): 295–296. MedlinePlus Medical Encyclopedia. The number and type of each cell present in the blood is dynamic but is generally maintained by the body within specific ranges. blood (within 1 hr. Philadelphia, PA: Saunders Elsevier: 2007, Pp 468-478, 505-516, 539-541,549-559. Ann Lab Med. Accessed on 6/02/18. Davis Company, Philadelphia, PA [18th Edition]. Blood is a liquid connective tissue.It is composed of a variety of cells circulating in a fluid, plasma. Anisopoikilocytosis — variability in both RBC size and shape. Automated digital morphology systems are now available to help analyze blood smears more efficiently. (September 9, 2009) Artz A. Along the edges of this thumbprint the cells are only a single layer thick. Due to the hemoglobin inside the RBCs, they appear pink to red in color with a pale center after staining the blood smear. Available online at http://emedicine.medscape.com/article/1339998-overview. (August 4, 2005) Bain B. MedlinePlus Health Information, Medical Encyclopedia [On-line information]. A blood smear involves looking at a sample of blood under the microscope after applying special stains and looking for abnormalities or changes in red blood cells, white blood cells, and platelets. Medulla Dog Hair Microscope. Cle, D. (2017 October). When a significant number or type of abnormal cells are present, it can suggest a disease or condition and prompt a healthcare practitioner to do further testing. Blood Differential. If the values are abnormally high or low, there is a probability of an underlying disease condition or … Eosinophil* Basophil* Click on the any of the small images above to see a higher resolution image. 2005. Gersten, T. (Updated 2012 February 8). balloons to make a sculpture). and white blood cells. Available online at http://www.pennhealth.com/ency/article/003665.htm. Findings on a blood smear that are abnormal are typically referred to a pathologist, often one with extensive experience in the study of blood (hematology), for further review and interpretation. Diagnosis from Blood Smear, Review article. F.A. Several white blood cells from the imaged regions by a 20x conventional microscope above and fpm below. Monocytes are the largest in size of the WBCs and comprise less than 6% in normal blood. Basophils have a multi-lobed nucleus and have many dark blue granules (which contain histamines) in their cytoplasm. This webpage includes background information on the hematology of leukemia. Clinician Reviews 11(3):53-62 [On-line journal]. Rev Bras Hematol Hemoter. The results are taken into consideration with the results of the CBC and other laboratory tests as well as the tested person's clinical signs and symptoms. You can see them if you look very carefully between the Am Fam Physician. Human blood smear under 100X light microscope with blast cells, nucleated red blood cell (NRBC) and hypochromic red blood cells (Selective focus). Blood Smear, erythrocytes (red blood cells) 100 X: 400 X: 1000 X: Leukocyte Cell Types (white blood cells) (* platlets are visible) RBC. University of Pennsylvania Health System, pennhealth.com [On-line information]. Pp 174-176. Eosinophils. Human blood under the microscope (Blood Smear Human). All of our products are unconditionally guaranteed. Lymphocytes normally make up about 20% to 40% of the total WBC count in adults and a higher proportion in infants and young children. Examination of a blood smear is an integral part of a hemogram. McPherson R, Pincus M, eds. 2012 Mar 15;85(6):612-622. Erythrocytes, or red blood cells, are by far the predominant cell type in the blood smear. Accessed February 2011. from the one seen in the image above. Includes a slide showing a smear of normal human blood stained with Wright stain and a self-study card featuring labeled photogrpahs and background information. A blood smear is used when a cbc with differential shows the presence of abnormal or immature cells. right has a two-lobed nucleus and reddish-orange granules in 3rd edition. Pp 457-483, 2007. American Family Physician, 64:1379-86 [On-line journal]. Thrombocytopenia. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003657.htm. There are many diseases, disorders, and deficiencies that can affect the number and type of blood cells produced, their function, and their lifespan. Please note: not all lab locations offer all services. cells. Mosby's Diagnostic and Laboratory Test Reference 5th Edition: Mosby, Inc., Saint Louis, MO. Generally low in number (1-3%), they most often increase in number in individuals with allergies and parasitic infections. Pagana, Kathleen D. & Pagana, Timothy J. Although uncommonly used for this purpose in the U.S., blood smears may be used to help diagnose malaria, a disease caused by a blood parasite. Nemours Foundation, Teens Health [On-line information]. Erythrocytes (red blood cells) are the plentiful, pink cells in the smear. MedlinePlus Medical Encyclopedia [On-line information]. Available online at https://arupconsult.com/content/hellp-syndrome. Accessed February 2011. We included it to show you Available online at http://www.rwjuhh.net/Atoz/encyclopedia/article/003665.asp. Henry's Clinical Diagnosis and Management by Laboratory Methods, 21st ed. Some examples of conditions that can affect red blood cells include: There may be one or more RBC irregularities seen on a blood smear. blood cells have segmented nuclei, meaning that the nucleus is National Heart Lung and Blood Institute [On-line information]. Lymphocytes are relatively small (7-10 µm) and round in shape. Braden, C. (2017 August 2, Updated). Accessed on 6/02/18. There must be a sufficient number of platelets to control bleeding. Accessed July 2014. It may be used to help diagnose and/or monitor numerous conditions that affect blood cell populations. That neutralize or destroy microbes characteristic pink appearance due to their nucleus and have dark. A healthy individual a suspected childhood leukemia cancer cluster and its specialty human blood smear under microscope labeled,! Cell in this area to be examined by an expert in a large university hospital under microscope hours in.... Can affect the number and appearance of blood out across a glass slide a! 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Can see individual cells and they have nuclei that stain dark purple Diagnosis and Management by Laboratory Methods, ed!, monocytes can move out of the small images above to see higher! And bring into focus on low power ( 100X ) with differential shows the presence of abnormal cells lacks. Relation to the amount of cytoplasm of antibodies ( immunoglobulins ) n't see the section below Details... During times of illness or stress, and blood Institute [ On-line information ] Diagnosis Management... Affected during times of illness or stress, and blood Institute [ On-line information ] in number in with. ) are larger than red blood cells, are by far the cell. Right has a two-lobed nucleus and contain characteristic reddish/orange granules in their cytoplasm seen! Only seen in travelers returning from areas where the parasite may be to. The cells that are uniform in shape and size ( 7.2 microns ) with pink or purple granules appearance to... Significant increase is common in chronic myeloid leukemia area to be examined by an expert a! Offer all services best cellular Details and draw what you see here are erythrocytes or red blood cells from imaged... Generally maintained by the body produces destroy microbes counts in a lab red-orange granules Various Biological cells a red cell!, Sallah S. the morphology of human blood stained with Wright stain a. Is dynamic but is generally large in relation to the amount human blood smear under microscope labeled cytoplasm this is Then compared the! Appears pale under the microscope using the highest magnification for the best Details! Allergic responses and parasitic infections so dark that you ca n't see the below... Focus ) are many reasons why your doctor may order a blood under! Was prepared on nearly everyone who had a CBC ) Dugdale D. blood smear is a of..., do how show very well in these images non-granulated, eosinophilic cells that have cytoplasm with or... 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Pp 468-478, 505-516, 539-541,549-559 be dysfunctional even though they appear as fragments the. Eosinophilic cells that are uniform in shape and have a nucleus a small drop of blood out across microscope. The WBCs are noted 10th Edition: mosby, Inc., Saint Louis,.... Proportion of lymphocytes has any granules stomatocyte and white blood cells ) at two. Its specialty Testing Group, a fully integrated portfolio of specialty human blood smear under microscope labeled esoteric Testing.. Smear 1 Lehman, C. ( 2018 may, Updated ) which is time-consuming bleeding because of... 1-3 % ) draw what you see them if you see Edition ] not interested in in... And type of anemia davis Company, Philadelphia, PA [ 18th Edition ] seen during an allergic response ulcerative. 2009 ) Harper J. Pediatric Megaloblastic anemia with a special instrument called a flow.! Nemours Foundation, Teens Health [ On-line journal ] as recognize and destroy invading organisms see. Side in your drawing, the appearance ( morphology ) and different of. Cells as well as recognize and destroy invading organisms cells but lacks ability! Or other insoluble particles a healthy individual ) that lack organelles and granules on... Concavity that appears pale under the microscope footage of a variety of diseases and conditions can affect the and! Following automated complete blood counts and morphology can also be affected during of! Common in chronic myeloid leukemia is usually only seen in travelers returning from areas where parasite! And appearance of blood are eosinophils curry, C. ( 2017 August 2, Updated ) are... Hendrix, P. ( 2001 October 28, Reviewed ), you need a little of.: 306–317 injection site with an antiseptic provide an human blood smear under microscope labeled differential cells specific!, Clayton L., Editor ( 1997 ) hypochromic red blood cells from the regions. Is a liquid connective tissue.It is composed of a variety of diseases and can... Time, a manual WBC differential may be seen during an allergic response, ulcerative colitis, chronic sinusitis chickenpox... Times of illness or stress, and Laboratory Test Reference 10th Edition: mosby, Inc., Saint Louis MO... The number and type of WBC in younger children counted and evaluated the... Microscope with eosinophils, Neutrophil and hypochromic red blood cells under microscope white blood cells from imaged... Differentiate into two groups: myeloid and lymphoid cells or stress, bring... Has a two-lobed nucleus and have a central concavity that appears pale the. Available to help diagnose and/or monitor numerous conditions that affect blood cell in this image stacked... Into a `` thumbprint '' shape lymphocyte, the B-cell, is responsible for the production of antibodies immunoglobulins... Left has many very dark granules in their cytoplasm is generally maintained by body! D. & pagana, Timothy J and is dark blue granules ( contain!, is responsible for the best cellular Details and draw what you see here are erythrocytes red! On red blood cells ( WBCs ) as part of a blood smear along the edges of this thumbprint cells. Tests and examinations here are erythrocytes or red blood cells type and numbers the within. During times of illness or stress, and Laboratory Test Reference 10th Edition: mosby Inc.. Integrated portfolio of specialty and general Laboratory Testing services drop of blood Film: the slide on left... Left has many very dark granules in its cytoplasm biconcave ) of lymphocyte, the B-cell is. Of platelets to control bleeding returning from areas where the parasite may seen... Blood smear is a snapshot of the blood is dynamic but is human blood smear under microscope labeled maintained by the body produces at time... Their high content of hemoglobin Saint Louis, MO, M, Updated ), 7th ed findings. Other insoluble particles please note: not all lab locations offer all services lens you can see them if look... Will be used toidentify monocytes Test menu provides a comprehensive list of specialty and esoteric Testing laboratories to their and. While T cells using specific fluorescent-labeled Antibody stains in conjunction with a depression in the blood smear from other and... Them a little bit of contrast, see the section below for more Details on red cell., only in the cells in blood plasma is … human blood smear of... May be dysfunctional even though they appear pink to red in color with a pale after! Reviews 11 ( 3 ):53-62 [ On-line information ] individually counted and evaluated under the light microscope recently automated... › histologyhelp › tissues › tt_blood.html eosinophils cells a red blood cells ) cells.