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Second heart sound is...

Second heart sound is

A

'dup' at the beginning of diastole

B

lubb' at the beginning of systole

C

'lubb' at the end of systole

D

'dup' at the end of diastole

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "Second heart sound is", we need to analyze the heart sounds and their timing in relation to the cardiac cycle. ### Step-by-Step Solution: 1. **Understanding Heart Sounds**: The heart produces two main sounds during each cardiac cycle, commonly referred to as "lub" and "dup". These sounds are associated with the closing of heart valves. 2. **Identifying the Sounds**: - The first heart sound, "lub", occurs when the atrioventricular (AV) valves (the mitral and tricuspid valves) close at the beginning of ventricular systole (the contraction phase of the heart). - The second heart sound, "dup", occurs when the semilunar valves (the aortic and pulmonary valves) close at the beginning of ventricular diastole (the relaxation phase of the heart). 3. **Timing of the Second Heart Sound**: The second heart sound, "dup", is specifically produced at the beginning of diastole, which is when the ventricles are relaxing and filling with blood again. 4. **Conclusion**: Therefore, the second heart sound is "dup at the beginning of diastole". ### Final Answer: The second heart sound is "dup at the beginning of diastole". ---
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Similar Questions

Explore conceptually related problems

Go through the following statements, (i) The stroke volume multiplied by heart rate gives the cardiac output. (ii) The second heart sound is associated with the closure of semilunar valves (iii) Heart failure is the same as cardiac arrest or a heart attack. Which of these are correct ?

Read the following four statements (1-4) (1 ) The second heart sound is DUB, which is associated with the closure of bicuspid and tricuspid valves . (2) The duration between consecutive second and first heart sound is 0.5 second in a cardiac cycle . (3) The heartbeat of a human increase when the adrenaline hormone in injected into it. (4) The atrial systole in a cardiac cycle increase the flow of blood into the respective ventricle by about 70% . How many of the above statements are incorrect ?

Knowledge Check

  • Consider the following four statements (i)-(iv) and select the correct option (i) Fish heart contains only oxygenated blood (ii) Closure of A-V valves produces the second heart sound (iii) The vascular connection between the digestive track and kidney is called hepatic portal system (iv) Purkinje fibres are nerve fibres present in the heart wall.

    A
    `{:("(i) (ii) (iii) (iv)"),("F F T F"):}`
    B
    `{:("(i) (ii) (iii) (iv)"),("F F F T"):}`
    C
    `{:("(i) (ii) (iii) (iv)"),("T T F T"):}`
    D
    `{:("(i) (ii) (iii) (iv)"),("T F T F"):}`

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

    A
    tricuspid valve
    B
    semilunar valves
    C
    biscuspid valve
    D
    tricuspid and biscuspid valves

    • Similar Questions

    Explore conceptually related problems

    Read the following statements (A-D) A. Coronary Artery Disease is also called atherosclerosis that affects the vessels that supply blood to the heart muscle. B. The electrocardiogram (ECG) on graph paper. During a cardiac cycle , the right ventricle pumps out about 70ml of oxygenated blood which is called stroke volume. D. The second heart sound is associated with the closure of the semilunar valves. How many statements from the above is / are incorrect ?

    Read the following statement (I - IV) I. The machine that is used to obtain ECG of a patient is called an electrocardiograph . II. The volume of blood pumped out by each ventricle per cardiac cycle is called the cardiac output . III. The second heart sound is associated with the opening of both semilunar values . IV. Hypertension is denoted by the ratio of systolic and diastolic pressure in mm of mercury pressure. How many statement (s) is/ are correct from the above ?

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

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

    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 events takes place in cardiac cycle after the end of first heart sound and before the onset of second heart sound?

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