Question

Give reasons for the following : (a) Exchange of gases at the alveolar surface continues even during expiration. (b) Trachea and bronchi do not collapse when air pressure decreases inside them

Answer 1

Answer:

a) During expiration foul air containing high partial pressure of CO2 is released from lungs to outer air

As a result the concentration of pure air O2 decreases in lungs thus to balance that exchange O2 is inspired .

b) Trachea and bronchi dont collapse du to the presnce of incomplete cartilaginous rings on them which hold and support them.

hope u understood it well.

Answer 2

(a) The exchange of gases at the alveolar surface continues even during expiration, as the carbon dioxide releases and the alveoli reduce in size to let the gas escape.  

(b) Trachea and bronchi do not collapse even when the air pressure decrease inside them, as there are rings of cartilage that keeps the structure stable.  

Explanation:  

• Respiration is one of the most vital functions of the living organisms, and it is formed of mainly two actions – inhalation and expiration.
• During the process of expiration, the gaseous carbon dioxide is released from the alveoli and lungs, and this process is called ventilation also.
• When the gases escape the alveoli gets reduced in sizes but the internal structure formed of cartilages keeps the structure intact and prevents it from collapsing.  

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