Home
Class 11
BIOLOGY
First heart sound results from a closure...

First heart sound results from a closure of semilunar valves.

Text Solution

AI Generated Solution

### Step-by-Step Solution: 1. **Understanding Heart Sounds**: The heart produces two primary sounds during its cycle, known as "lub" and "dub." These sounds are associated with the closure of specific heart valves. 2. **Identifying the First Heart Sound**: The first heart sound, often referred to as "lub," is produced when the atrioventricular (AV) valves close. The AV valves are located between the atria and the ventricles. 3. **Types of Atrioventricular Valves**: The two main atrioventricular valves are: - The tricuspid valve (located between the right atrium and right ventricle) ...
Promotional Banner

Topper's Solved these Questions

  • BODY FLUIDS AND CIRCULATION

    MODERN PUBLICATION|Exercise QUICK MEMORY (Complete the missing links)|17 Videos

  • BODY FLUIDS AND CIRCULATION

    MODERN PUBLICATION|Exercise QUICK MEMORY (Choose the correct alternative)|12 Videos

  • BODY FLUIDS AND CIRCULATION

    MODERN PUBLICATION|Exercise HIGHER ORDER THINKING SKILLS & BRAIN TWISTING (Long Answer Questions)|2 Videos

  • BIOMOLECULES

    MODERN PUBLICATION|Exercise CASE BASED SHORT ANSWER TYPE QUESTIONS|1 Videos

  • BREATHING AND EXCHANGE OF GASES

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|14 Videos

Similar Questions

Explore conceptually related problems

Indicate whether the following statements are true of false : (a) Both auricles of amphibian heart open into the same ventricle. (b) Prawn's heart carries only oxygenated blood. (c ) Purkinje fibres are nerve fibres supplying the ventricular muscles. (d) The first heart sound results from a closure of semilunar valves. (e ) The vagus nerve reduces the heart rate. (f) The A-V node normally initiates the cardiac impulse. (g) Semilunar valves open during the ventricular diastole.

First heart sound is :-

First heart sound occurs at

First Heart sound is due to

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 statements carefully and select correct choice from below: (a) First heart sound lub is produced due to closure of atrioventricular valves, (b) First heart sound is of longer duration than second heart sound dub.

The Ventricles are relaxed and the Ventricular pressure falls causing the closure of semilunar valves. These events are related to .

The ventricular muscles relax and the ventricular pressure falls causing the closure of semilunar valves. These events are related to

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.

Assertion : LUBB (First Sound) is of shorter duration and sharp sound. Reason : It is created by the closure of the semiluar valves.