Question

Give reason.
Glotlis is covered by epiglotlis.

Answer 1

The opening between the vocal cords at the upper part of the voice box is called glottis . At the top of the trachea there is a small flap known as the epiglottis.
Reason- When we swallow food epiglottis closes off the trachea to prevent food going into the lungs.Because if food enters trachea,it chokes the trachea.

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Answer 2

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