Question

Lungs always
- volume of air
contain
Justify
a residual.
the statement. i will give you 50 marks​

Answer 1

Answer:

The main function of thelungs is the process of gas exchange called respiration (or breathing). In respiration, oxygen from incoming air enters the blood, and carbon dioxide, a waste gas from the metabolism, leaves the blood.

• Volume of air

Answer 2

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● During breathing cycle, the residual volume of air in lungs provide the advantage as it prevents the lungs from collapsing.

● Also, due to the presence of residual volume, there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released during breathing.