Give reasons for the folowing in 20-40 words :

1) the glottis is guarded by epiglottis

2)the lung alveoli are covered with blood capillaries

3) the wall of trachea is supported by cartilage rings

Plz answer fast

1. Epiglottis is a thin, valve like, flexible cartilaginous tissue that covers the glottis during swallowing in order to prevent the entry of food and water into wind pipe.
2. Lung alveoli are covered with blood capillaries for the exchange of gases to take place and oxygen can easily diffuse into the blood stream and be transported to various parts of the body through the heart.
3. The walls of trachea are very thin. The cartilaginous rings covering the trachea prevent it from collapsing. The rings keep trachea open for air to move in and out. 

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