Pre-Medicine

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MCAT

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Cardiovascular

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Blood

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  • Topic Anchor: Blood
    • Function
      • Transports oxygen, nutrients, waste products, and hormones throughout the body
    • Composition
      • Plasma
        • Liquid portion of blood
        • 90% water
        • 10% proteins and other compounds
          • Albumins, immunoglobulins, fibrinogen, clothing factors, hormones, electrolytes, nutrients, gases
      • Cellular components
        • All cellular components of blood arise from the bone marrow
        • Leukocytes (white blood cells, WBCs)
          • Function: Immunity (will cover in-depth in immunology section)
        • Erythrocytes (red blood cells, RBCs)
          • Hematocrit is percentage of RBCs in blood by volume
          • Function: transport of oxygen and carbon dioxide
          • Characteristics
            • no nuclei
              • Do not undergo mitosis 
            • No organelles (mitochondria)
            • Contain hemoglobin (will cover in-depth in hemoglobin video)
              • Used to bind and transport oxygen
        • Platelets
          • Function
            • blood clotting (will cover in clotting video)
          • Characteristics
            • Non-nucleated cell fragments
            • Derived from megakaryocytes