Question

Give reasons for the following

(a) The glottis is guarded by epiglottis.

(b) The lung alveoli are covered with blood capillaries.

(c) The wall of trachea is supported by cartilage rings.​

Answer 1

Answer:

a.

Glottis is covered by a small cartilaginous flap of skin called epiglottis. This prevents the entry of food particles into wind pipe while swallowing. If the food enters the wind pipe, it causes choking and may even result in death of the person.

b.

Alveoli present in the lungs are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. ... This allows oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood.

c.

The wall of the trachea is supported by the C shaped cartilaginous rings which supports the trachea and protects the trachea to collapsing during time of breathing when air gives the pressure. The trachea is also called as a wind pipe. This also helps in passage of air to lungs.

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Answer 2

[a] Glottis is covered by a small cartilaginous flap of skin called epiglottis. This prevents the entry of food particles into wind pipe while swallowing. If the food enters the wind pipe, it causes choking and may even result in death of the person.

[b]  Alveoli present in the lungs are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. ... This allows oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood.

[c] The wall of the trachea is supported by the C shaped cartilaginous rings which supports the trachea and protects the trachea to collapsing during time of breathing when air gives the pressure. The trachea is also called as a wind pipe. This also helps in passage of air to lungs.

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