Question

Assertion : The abdominal muscles are primarily involved in generating pressure gradient between the lungs and the atmosphere.
Reason : The strength of inspiration and expiration can be increased by additional muscles in diaphragm and intercostal muscles.
A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true and reason is not the correct explanation of assertion
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer 1

Correct Answer - D
The diapharam and a specialised set of muscles-external and internal intercoastals between the ribs, help in gererating pressure gradient. Besiders this we can increase the strength of inspiration and expiration with the help of additional muscles in the abdomen.