The sequence Ta-LUB-dub corresponds to which sounds?

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Multiple Choice

The sequence Ta-LUB-dub corresponds to which sounds?

Explanation:
Understanding heart sounds and when they occur in the cardiac cycle is the key. “Lub” and “dub” are the two main sounds: “lub” (S1) happens when the AV valves close at the start of systole, and “dub” (S2) happens when the semilunar valves close at the end of systole. An extra sound heard just before S1, often described as “ta” (sometimes sung as “ta-lub-dub” or “ten-nes-see” for S4), is the atrial gallop produced by atrial contraction pushing blood into a stiff ventricle. So the sequence ta-lub-dub maps to S4 followed by S1 and then S2. S3 would occur after S2 in early diastole and is not part of this pattern.

Understanding heart sounds and when they occur in the cardiac cycle is the key. “Lub” and “dub” are the two main sounds: “lub” (S1) happens when the AV valves close at the start of systole, and “dub” (S2) happens when the semilunar valves close at the end of systole. An extra sound heard just before S1, often described as “ta” (sometimes sung as “ta-lub-dub” or “ten-nes-see” for S4), is the atrial gallop produced by atrial contraction pushing blood into a stiff ventricle.

So the sequence ta-lub-dub maps to S4 followed by S1 and then S2. S3 would occur after S2 in early diastole and is not part of this pattern.

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