Gaseous Exchange in Humans


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  • Gaseous exchange in humans
    • Ventilation - the movement of air in and out of a body
    • Alveoli
      • Single layer  of epithelial cells.
      • Capillaries run close to the surface (one cell thick)
      • Secrete liquid to prevent the alveoli from collapsing.
      • Simple  diffusion - Oxygenated air in the alveoli. Deoxygenated blood in the capillaries
      • Large surface area
    • Breathing
      • Inhaling
        • -Diaphragm lowers and contracts


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