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Contraction of the ventricle in the heart begins by the command from
- a)Purkinje fibres
- b)AV node
- c)chordae tendinae
- d)SA node
Correct answer is option 'D'. Can you explain this answer?
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Contraction of the ventricle in the heart begins by the command froma...
Understanding Heart Contraction Initiation
The contraction of the ventricles in the heart is initiated by electrical impulses that originate from a specialized group of cells known as the Sinoatrial (SA) node.
Role of the SA Node
- The SA node, located in the right atrium, is often referred to as the heart's natural pacemaker.
- It generates electrical impulses that spread through the heart, coordinating the heartbeat.
Impulses and Heart Rhythm
- The electrical impulses from the SA node cause the atria to contract first, pushing blood into the ventricles.
- After a brief delay, the impulses travel to the Atrioventricular (AV) node, which acts as a relay station.
Contraction of the Ventricles
- Once the impulses reach the AV node, they are then transmitted through the Bundle of His and into the Purkinje fibers.
- This sequence ensures that the ventricles contract after the atria, allowing efficient blood flow from the heart.
Conclusion
- Thus, the contraction of the ventricles is primarily initiated by the SA node, making it the correct answer to the question.
- Understanding this sequence is crucial for grasping the heart's electrical conduction system, essential for maintaining proper heart function and rhythm.
The contraction of the ventricles in the heart is initiated by electrical impulses that originate from a specialized group of cells known as the Sinoatrial (SA) node.
Role of the SA Node
- The SA node, located in the right atrium, is often referred to as the heart's natural pacemaker.
- It generates electrical impulses that spread through the heart, coordinating the heartbeat.
Impulses and Heart Rhythm
- The electrical impulses from the SA node cause the atria to contract first, pushing blood into the ventricles.
- After a brief delay, the impulses travel to the Atrioventricular (AV) node, which acts as a relay station.
Contraction of the Ventricles
- Once the impulses reach the AV node, they are then transmitted through the Bundle of His and into the Purkinje fibers.
- This sequence ensures that the ventricles contract after the atria, allowing efficient blood flow from the heart.
Conclusion
- Thus, the contraction of the ventricles is primarily initiated by the SA node, making it the correct answer to the question.
- Understanding this sequence is crucial for grasping the heart's electrical conduction system, essential for maintaining proper heart function and rhythm.
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Community Answer
Contraction of the ventricle in the heart begins by the command froma...
The SA node has the inherent power of generating a wave of contraction and controlling the heartbeat. Hence, it is known as the pacemaker.
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Contraction of the ventricle in the heart begins by the command froma)Purkinje fibresb)AV nodec)chordae tendinaed)SA nodeCorrect answer is option 'D'. Can you explain this answer?
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