Home
Class 12
BIOLOGY
First cardiac sound (lub) is associated ...

First cardiac sound (lub) is associated with -

A

Closure of tricuspid and bicuspid valves

B

Opening of tricuspid and bicuspid valves

C

Closure of semilunar valves

D

Opening of semilunar valves

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question regarding the first cardiac sound (lub), we can break it down into the following steps: ### Step-by-Step Solution: 1. **Understanding Cardiac Sounds**: The heart produces two primary sounds during its cycle: S1 (lub) and S2 (dub). These sounds are associated with specific events in the cardiac cycle. 2. **Identifying S1 Sound**: The first heart sound, known as S1, is commonly referred to as the "lub" sound. This sound marks the beginning of ventricular contraction (systole). 3. **Cause of S1 Sound**: The S1 sound is primarily caused by the closure of the atrioventricular (AV) valves. The AV valves include 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). 4. **Conclusion**: Therefore, the first cardiac sound (lub) is associated with the closure of the AV valves, specifically the tricuspid and bicuspid valves. ### Final Answer: The first cardiac sound (lub) is associated with the closure of the atrioventricular (AV) valves, which include the tricuspid and bicuspid valves. ---
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statement and choose the correct option. A. The first heart sound (lub) is associated with the closure of both semilunar valves. The duration between the adjacent second heart sound and first heart sound is 0.3 seconds C. The cardiac output is the stroke volume multiplied by the number of heartbeats per minute.

Which of the following statement is CORRECT ? I. Heart, the mesodermally derived organ, is situated in the thoracic cavity, in between the two lungs , slightly tilted to the left. II. During joint diastole , tricuspid and bicuspid valves are open and the semilunar values are closed. III. The first heart sound (lub) is associated with the closure of the tricuspid and biscuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves . IV. Neural signals through the sympathetic nerves can increases the rate of hearbeat, the strength of ventricular contraction and thereby the cardiac output.

The first heart sound lubb' is associated with

The second heart sound (dub) is associated with the closure of

The second heart sound (dubb) is associated with the closure of

The first heart sound is associated with :-

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