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First heart sound is associated with the...

First heart sound is associated with the closure of _______ valves whereas second heart sound is associated with the closure of _____valves.

A

(1) semilunar , atrioventricular

B

(2) atrioventricular, semilunar

C

(3) bicuspid, tricuspid

D

(4) tricuspid, bicuspid

Text Solution

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The correct Answer is:
To answer the question regarding the association of heart sounds with the closure of specific valves, we can break it down into clear steps: ### Step-by-Step Solution: 1. **Understanding Heart Sounds**: - The heart produces two main sounds during each cardiac cycle, commonly referred to as the "lub" and "dub" sounds. 2. **Identifying the First Heart Sound**: - The first heart sound, known as "lub," occurs at the beginning of ventricular contraction (systole). - This sound is primarily associated with the closure of the atrioventricular (AV) valves. 3. **Identifying the Atrioventricular Valves**: - The atrioventricular valves consist of two main valves: the tricuspid valve (located between the right atrium and right ventricle) and the bicuspid (or mitral) valve (located between the left atrium and left ventricle). - Therefore, the first heart sound is associated with the closure of the tricuspid and bicuspid valves. 4. **Identifying the Second Heart Sound**: - The second heart sound, known as "dub," occurs at the end of ventricular contraction (diastole). - This sound is associated with the closure of the semilunar valves. 5. **Identifying the Semilunar Valves**: - The semilunar valves include the aortic valve (located between the left ventricle and the aorta) and the pulmonary valve (located between the right ventricle and the pulmonary artery). - Thus, the second heart sound is associated with the closure of the aortic and pulmonary valves. 6. **Final Answer**: - Therefore, the first heart sound is associated with the closure of **atrioventricular valves**, and the second heart sound is associated with the closure of **semilunar valves**. ### Final Answer: - First heart sound is associated with the closure of **atrioventricular valves** whereas second heart sound is associated with the closure of **semilunar valves**.
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