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Question

Explain the schematic representation of gaseous exchange in tissues?


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Solution

Gaseous exchange: It is referred to as the exchange of gases at tissue level between carbon dioxide and oxygen. The oxygen is made available to the cells whereas carbon dioxide is expelled out.

Exchange of gases in the tissues:

  1. The alveoli in the lungs are the primary site for the exchange of gases but the exchange of gasses also occurs between the blood and the tissues. O2 and CO2 exchange occur through simple diffusion due to differences in partial pressure.
  2. The pO2 in the capillaries is 95 whereas pCO2 is 40 but in the case of tissue, pO2 is 40 and pCO2 is 45. So we see there is a difference in the partial pressure of oxygen and carbon dioxide both in tissues and capillaries there will be an exchange of gases by simple diffusion.
  3. We know that the gases travel from higher partial pressure to lower partial pressure, so there will be the transport of oxygen from the capillaries to the tissue(pO2 95 ⇢pO2 40). Similarly, Carbon dioxide will also travel from the tissues to the capillaries(pCO2 45⇢pCO2 40).

Hence this is how the exchange of gases takes place in the tissues.

What is the partial pressure of oxygen in the alveoli of lungs? Get the  Answer at BYJU'S NEET

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