Question

Give reasons for the following:

(i) The glottis is guarded by epiglottis.

(ii) The lungs alveoli are covered with blood capillaries.

(iii) The wall of the trachea is supported by cartilaginous rings.

Answer 1

1. Glottis is the opening of the trachea. Epiglottis prevents the food material from entering the trachea thereby preventing choking.

2. The lung alveoli have capillaries for the diffusion of oxygen into the capillaries from the alveoli and for the diffusion of co2 from the capillaries to the alveoli leading to gaseous exchange.

3. The trachea is supported by incomplete c shaped hyaline cartilaginous rings to prevent it from collapsing in the absence of air in the trachea

Answer 2

Answer:

1. Glottis is the opening of the trachea. Epiglottis prevents the food material from entering the trachea thereby preventing choking.

2. The lung alveoli have capillaries for the diffusion of oxygen into the capillaries from the alveoli and for the diffusion of co2 from the capillaries to the alveoli leading to gaseous exchange.

3. The trachea is supported by incomplete c shaped hyaline cartilaginous rings to prevent it from collapsing in the absence of air in the trachea

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