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A man has a diastolic heart murmur. The AV valves are open during diastole, but if they are stenotic they will not open all the way, so blood is forced through with a hissing sound - a diastolic murmur.

The semilunar valves should be closed during diastole. If they are regurgitant, you will hear blood leak through them and it will cause a murmur after the second heart sound, which is caused by the semilunar valves shutting at the end of systole.

You should be able to use this flow chart to explain:

What valve defects could cause a systolic murmur

What murmurs would result from aortic stenosis, aortic regurgitation, mitral stenosis, and mitral regurgitation.

Cardiac Cycle Problem
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	A man has a diastolic heart murmur. The AV valves are open during diastole, but if they are stenotic they will not open all the way, so blood is forced through with a hissing sound - a diastolic murmur. The semilunar valves should be closed during diastole. If they are regurgitant, you will hear blood leak through them and it will cause a murmur after the second heart sound, which is caused by the semilunar valves shutting at the end of systole. You should be able to use this flow chart to explain: What valve defects could cause a systolic murmur What murmurs would result from aortic stenosis, aortic regurgitation, mitral stenosis, and mitral regurgitation.	AV valves are open during diastole if they don't open all the way, you'll hear a murmur semilunar valves are shut during diastole. If they leak, you will hear a murmur after the second heart sound.