Question

Explain why all of the oxygen molecules found within inhaled air cannot be exchanged with the...

Explain why all of the oxygen molecules found within inhaled air cannot be exchanged with the alveolar-capillary blood.

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Answer #1

Answer

  • All the air that is inhaled through the nose does not get involved in gaseous exchange.
  • Some of the air remains in the conducting airways (Nose, pharynx, trachea, bronchi).
  • These regions are known as anatomical dead space as no gaseous exchange takes place here.
  • Also, the air reaching alveolar dead space (the aveoli lacking capillaries around them) also cannot involve in gasous exchange.
  • Normal tidal volume is 500 ml. Only 350 ml of air reaches the surface of gaseous exchange.
  • 150 ml of the air remains in the dead space.
  • The air present in dead space is exhaled without any involvement in gaseous exchange.


Hence, all of the oxygen molecules found within inhaled air cannot be exchanged with the alveolar-capillary blood.

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