Give reasons for the following: (i) The glottis is guarded by epiglottis. (ii) The lung alveoli are covered with blood capillaries. (iii) The wall of trachea is supported by cartilage rings.
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(i) The glottis is guarded by epiglottis because it prevents the entry of food in wind pipe. If the food enters wind pipe, then it chokes it, leading to the death of the person.
(ii) The lung alveoli are covered with blood vessels because the oxygen that we inhale dissolves in the blood, present in these blood capillaries only, as it reaches the lungs.
(iii) The wall of trachea is supported by cartilage rings because these rings prevent the air passage from collapsing.
(ii) The lung alveoli are covered with blood vessels because the oxygen that we inhale dissolves in the blood, present in these blood capillaries only, as it reaches the lungs.
(iii) The wall of trachea is supported by cartilage rings because these rings prevent the air passage from collapsing.
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Answer:
a) The glottis is guarded by epiglottis because it prevents the entry of food in wind pipe. If the food enters wind pipe, then it chokes it
b) The lung's 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 the alveoli the gaseous exchange takes place.
c) The wall of the trachea is supported by cartilage rings to prevent it from collapsing when there is no air in it.
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