Assertion (A) In normal breathing, inspiration is an active process. Reason (R) Inspiration is facilitated by contraction of diaphragm and external intercostal muscles.

Question

Assertion (A) In normal breathing, inspiration is an active process. Reason (R) Inspiration is facilitated by contraction of diaphragm and external intercostal muscles. (A) If both A and R are true and R is the correct explanation of A (B) If both A and R are true, but R is not the correct explanation of A (C) If A is true, but R is false (D) If A is false, but R is true

Tardigrade Admin · Accepted Answer

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Inspiration is an active process whereas expiration is a passive process. During inspiration, diaphragm and external intercostal muscles contract to increase the overall volume of the thoracic cavity. As a result, the pressure inside the lungs is less as compared to atmospheric pressure. Also, for this inspiration muscle uses energy for contraction, thus it is referred to as an active process.

Q. Assertion (A) In normal breathing, inspiration is an active process. Reason (R) Inspiration is facilitated by contraction of diaphragm and external intercostal muscles.

If both A and R are true and R is the correct explanation of A

If both A and R are true, but R is not the correct explanation of A

If A is true, but R is false

If A is false, but R is true

Q. Assertion (A) In normal breathing, inspiration is an active process.
Reason (R) Inspiration is facilitated by contraction of diaphragm and external intercostal muscles.