The walls of the air sacs and the capillaries and both very thin. Suggest how this helps gas exchange to take place quickly.
Answers
Explanation:
Diffusion of oxygen into the blood takes place at the alveoli (air sacs). The alveoli are very close to capillaries, which are small blood vessels. The blood in the capillaries has very little oxygen and has a lot of carbon dioxide.
The walls of both the alveoli and the capillaries are very thin and oxygen and carbon dioxide move along the concentration gradient. This movement is called diffusion.
Oxygen diffuses from the alveoli, into the blood in the capillaries. Similarly, carbon dioxide from the blood moves out of the capillaries into the alveoli.
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viens carry dioxiginated blood through vena cava it transport originated blood to right atrium and then right ventricle and then it go on pulmonary arteries and then in lungs
lungs purified it purified blood goes to left ventricle with the help of pulmonary viens and then in left ventricle and then in artery and capillaries spread in all organs of body