BLOOD

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BLOOD
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Blood

• Functions
• transports vital substances (O2, CO2, nutrients,
  hormones)
• carries metabolic wastes to kidneys
• transports immune cells to site of infection
• protective
• Blood Cells
• red blood cells
• white blood cells
• platelets

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Blood Composition
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Red Blood Cells

• erythrocytes
• lack nuclei and mitochondria
• biconcave
• one-third hemoglobin
• 4-6 million RBCs in a microliter of blood

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White Blood Cells

• leukocytes
• protect against disease
• not confined to bloodstream -
• Never Let Monkeys Eat Bananas

• granulocytes
• neutrophils
• eosinophils
• basophils

• agranulocytes
• lymphocytes
• monocytes

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Diapedesis

• leukocytes squeeze through capillary walls to
  enter tissue space outside the blood vessel

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Blood Plateletsthrombocytes

• thrombocytes
• cell fragments of megakaryocytes
• 150,000 400,000 per µl of human blood
• clotting activity helps control blood loss from
  broken vessels

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Platelet Plug Formation
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Blood Plasma

• straw colored
• liquid portion of blood
• 55 of blood

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ABO Blood Group
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Rh Factor

• Rh positive blood
• Rh negative blood