3. Process
involved in gaseous exchange in mammals
Answer
Gaseous
exchange mammals occurs in the alveoli.Alveoli are the respiratory surface for
human and mammals.Each alveolus is a tiny sac with just one cell thick.The
inner surface of the alveolus is always moist.Right on the outside of alveoli
is a network of blood capillaries.Blood in the pulmonary capillary has a low
partial pressure of oxygen compared to the air in the alveolus.Hence,oxygen
dissolves in the moisture on the alveolar surface and diffuses into blood
capillary.Oxygen subsequently enters the red blood cell and bind to haemoglobin
molecule,forming oxyhaemoglobin.The partial pressure of carbon dioxide in the
blood of capillary is higher compared to the air in the alveolus.So,carbon
dioxide diffuses from blood capillary into the alveolus to be exhaled
out.Partial pressure of carbon dioxde in the interstitial fluid is higher
compared to the blood in the capillary.Carbon dioxide diffuses from the
interstitial fluid into the blood.The partial oxygen pressure in the blood
capillary is higher compared to interstitial fluid.Oxygen diffuses from blood
into the tissue cells.
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