Give reasons for the following:
(a) The glottis is guarded by epiglottis.
(b)The lung alveoli are covered with blood capillaries
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(a) Glottis is guarded by epiglottis to prevent food from entering the windpipe at the time of swallowing. (b) The lung alveoli are covered with blood capillaries for the easy diffusion of respiratory gases, since both alveoli and blood capillaries are thin-walled.
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Answer:b)The lungs alveoli are covered with blood capillaries as the blood capillaries are the means of transport of the pure air as well as the air rich in carbon dioxide. And after reaching to the alveoli the gaseous exchange takes place.
Explanation:
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