Question

Assertion: Lungs always contain a residual volume of air. Reason: It is so to ensure enough time for the release of CO2 and for the absorption of O2. a) Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation of the assertion. (c) Assertion is true but Reason is false. (c) Assertion is false but Reason is true.

Answer 1

Answer:

(c) Assertion is true but Reason is false.

Explanation:

• lungs are present in a air tight camber created my the chest anatomy including ribs and diaphragm.

• as there must be some amount of pressure present inside the lungs for proper breathing therefore it always contains a residual amount of air called the residual volume which is 1200 ml approx. in an adult human.

• this residual volume of air prevents lungs from puncturing and collapsing during breathing.