Question

how does valvular aortic stenosis affect the s2 heart sound?
s2 is heard less crisply, as the a2 component is affected by degenerating sclerotic tissue.
s2 is heard less crisply, as the p2 component is affected by degenerating sclerotic tissue.
s2 is heard more crisply, as the a2 component is affected by degenerating sclerotic tissue.
s2 is heard more crisply, as the p2 component is affected by degenerating sclerotic tissue.
aortic stenosis causes splitting of the s2 heart sound, which is heard more easily.

Explanation:

In valvular aortic stenosis, the A2 (aortic - component of S2) is affected by degenerating sclerotic tissue, which makes the S2 heart sound heard less crisply. The P2 component is related to the pulmonary valve and is not the main factor here. Aortic stenosis does not cause S2 to be heard more crisply or cause splitting that is more easily heard in the context of S2 crispness.

Answer:

A. S2 is heard less crisply, as the A2 component is affected by degenerating sclerotic tissue.