Lubb Dupp

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Last updated 4:19 PM on 4/14/26
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12 Terms

1
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what causes the Lubb (S1) sound

closure of AV valves (tricuspid and mitral)

2
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What causes the “dupp” (S2) sound?

Closure of semilunar valves (aortic + pulmonary)

3
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When does lubb (S1) occur?

Start of systole (ventricular contraction)

4
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When does dupp (S2) occur?

Start of diastole (ventricular relaxation)

5
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What happens RIGHT AFTER lubb?

Ventricles contract → blood is ejected

6
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What happens RIGHT AFTER dupp?

Ventricles relax → filling begins

7
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: Which valves are CLOSED during lubb?

AV valves just closed

8
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Which valves are CLOSED during dupp?

Semilunar valves

9
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Which valves are OPEN right after lubb?

Semilunar valves

10
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Which valves are OPEN right after dupp?

AV valves

11
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Lubb

systole and ejection

12
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Dupp

diastole, filling