USMLE

Blood

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Cardiovascular
  1. Cardiovascular Overview
  2. CO2 Transport
  3. Heart
  4. Cardiac Impulse
  5. Blood Pressure
  6. Arteries and Arterioles
  7. Veins and Venules
  8. Capillaries
  9. Circulation
  10. Blood
  11. Hemoglobin
  12. Blood Clotting
  • 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