mechanism of gaesous exchange in human
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Gaseous exchange in humans occurs through diffusion. In lungs, oxygen from alveolar air diffuses into blood vessels surrounding the capillaries and carbon dioxide from blood is given out into lungs. This oxygen is carried to the tissues and it diffuses from the blood vessels into the tissues.
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Hii brother
Firstly the respiratory pigment in animals in known as haemoglobin but alveoli plays a very crucial roll in this the blood get oxygen fromm them and veins transfer blood to every part of body to alveoli and then arteries transfer it the whole body the heart has a role of pumping blood........
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