Exercise 19
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Exercise 19
Blood
Portland Community CollegeBI 232
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Blood
• Highly specialized connective tissue that consists of formed elements (blood cells) suspended in a fluid matrix (plasma)
• Formed elements comprise about 45% of total volume
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Erythrocyte
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Erythrocyte (RBC)
• Flattened biconcave discs that lack nuclei and most organelles.
• Most of the cytoplasm is filled
with the protein hemoglobin
• Function: Transport of O2 and CO2
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Iron Deficient RBC
• More pale and smaller
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Sickle Cell
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Reticulocyte
• Count: 1-2% of RBC
• RBC precursor
• Increased when RBC turnover is high
• Still contains nuclear fragments
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White Blood Cells
• Defend the body from pathogens and foreign proteins.
• Capable of migrating from blood vessels to surrounding tissues by diapedesis.
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Neutrophil (Granulocyte)
• Nuclei: 2 to 5 lobes connected by thin strands (polymorphonuclear)
• Fine, pale lilac practically invisible granules
• Lifespan of about 10 hrs
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Neutrophil
• Count: 40- 70% 3,000-7,000 per mm3
• Fastest response of all WBC to bacteria
• Functions:• Phagocytic: engulf pathogens or debris in tissues
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Eosinophil (Granulocyte)
• Nucleus with 2 or 3 lobes connected by a thin strand
• Large, uniform-sized orange-red granules
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Eosinophil
• Count: 2-4%• 100-400 per mm3
• Functions: • Phagocytic: engulf antibody-labeled materials• Release cytotoxic enzymes• Reduce inflammation
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Basophil (Granulocyte)
• Large, dark purple, variable-sized granules
• Obscure the nucleus
• Irregular, s-shaped, bi-lobed nuclei
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Basophil
• Count: <1%• 20-50 per mm3
• Functions: • Enter damaged tissues and release histamine
and other chemicals that promote inflammation
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Monocyte (Agranulocyte)
• Nucleus is kidney or horse-shoe shaped
• Pale cytoplasm
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Monocyte
• Count: 2-8%• 100-700 per mm3
• Functions:• Enter tissues to become macrophages• Engulf pathogens or debris
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Lymphocyte (Agranulocyte)
• Dark, oval to round nucleus
• Cytoplasm sky blue in color
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Lymphocyte
• Count: 20-30%• 1,500-3,000 per mm3
• Functions:• Mount immune response by direct attack or via
antibodies, mediates other cellular immune response,
• Includes B and T cells
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Platelets
• Fragments of a bone marrow cell called a megakaryocyte
• Count: 150-500,000 per mm3
• Function: mediates blood clotting chemically and mechanically
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Platelets
Megakaryocytes Platelet
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Hemoglobin Concentrations
• Normal hemoglobin concentration in females is 12-16 g/deciliter.
• Normal hemoglobin concentration in males is 13-18 g/deciliter.
• Hematocrit can be estimated from the hemoglobin concentration:
3x hemoglobin=hematocrit.• Normal hematocrit in females is 37-48%. • Normal hematocrit in men is 42-52%.
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Gender Differences in Hb
• Testosterone stimulates synthesis of erythropoietin which in turn stimulates erythropoiesis (red cell formation) in the red marrow.
• Lower values in women of reproductive age may also reflect their red cell losses due to menstruation.
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ABO Blood Types
• RBC surfaces are marked by genetically determined glycoproteins • The glycoprotein determines the
blood type
• Plasma contains isoantibodies or agglutinins to the A or B antigens not found on your blood cells
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Type A
• Type A: Display only antigen A
• The plasma contains antibodies against Type B
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Type B
• Type B: Display only antigen B
• The plasma contains antibodies against Type A
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Type AB
• Type AB: Display both antigens A & B
• The plasma contains no antibodies
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Type O
• Type O: Display neither antigen
• The plasma contains antibodies against A and B
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Blood Transfusions
• Only RBC are donated.• Transfusion Reactions: The recipients plasma interacts with
the donors RBC• Causes clumping then hemolysis
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RH blood groups
• People with Rh agglutinogens on RBC surface are Rh+. Normal plasma contains no anti-Rh antibodies
• Antibodies develop only in Rh- blood type & only with exposure to the antigen• Transfusion of positive blood• During a pregnancy with a positive blood type fetus
• Transfusion reaction upon 2nd exposure to the antigen results in hemolysis of the RBCs in the donated blood
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Not Possible
Not Possible
Possible
Possible
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Lab activities
• ID blood cells on slides can use prepared class slides or make your own.
• Do differential white blood cell count
• Determine your blood type
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The End