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Contraction of the ventricle in the heart begins by the command from [1999]
- a)Chordae tendinae
- b)S.A. node
- c)Purkinje fibres
- d)A. V. node
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Contraction of the ventricle in the heart begins by the command from [...
SA is the site of generation of the rhythmic cardiac impulse. AV node is a compact mass of myogenic fibres which receives impulse from SA node and transmits it to ventricles. Purkinje fibres are in contact with the contractile muscles of the ventricular walls. Chordae tendinae are the muscles which keep the AV valves in position.
Most Upvoted Answer
Contraction of the ventricle in the heart begins by the command from [...
Contraction of the ventricle in the heart begins by the command from the S.A. node.
Explanation:
- The heart has a specialized conducting system that controls the rhythm and coordination of its contractions.
- The S.A. (sinoatrial) node is a small mass of specialized cardiac muscle fibers located in the wall of the right atrium near the opening of the superior vena cava.
- The S.A. node acts as the natural pacemaker of the heart, generating electrical impulses that spread through the atria and stimulate their contraction.
- The electrical impulses from the S.A. node are conducted through the atrioventricular (A.V.) node, which is located in the interatrial septum near the tricuspid valve.
- From the A.V. node, the impulses are transmitted through the bundle of His (a bundle of specialized fibers) and its branches (Purkinje fibers) to the ventricles.
- The Purkinje fibers are responsible for the rapid conduction of the impulses to the ventricles, which results in the synchronized contraction of both ventricles.
- Therefore, the command for contraction of the ventricles begins with the electrical impulses generated by the S.A. node.
Explanation:
- The heart has a specialized conducting system that controls the rhythm and coordination of its contractions.
- The S.A. (sinoatrial) node is a small mass of specialized cardiac muscle fibers located in the wall of the right atrium near the opening of the superior vena cava.
- The S.A. node acts as the natural pacemaker of the heart, generating electrical impulses that spread through the atria and stimulate their contraction.
- The electrical impulses from the S.A. node are conducted through the atrioventricular (A.V.) node, which is located in the interatrial septum near the tricuspid valve.
- From the A.V. node, the impulses are transmitted through the bundle of His (a bundle of specialized fibers) and its branches (Purkinje fibers) to the ventricles.
- The Purkinje fibers are responsible for the rapid conduction of the impulses to the ventricles, which results in the synchronized contraction of both ventricles.
- Therefore, the command for contraction of the ventricles begins with the electrical impulses generated by the S.A. node.
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Community Answer
Contraction of the ventricle in the heart begins by the command from [...
B
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Contraction of the ventricle in the heart begins by the command from [1999]a)Chordae tendinaeb)S.A. nodec)Purkinje fibresd)A. V. nodeCorrect answer is option 'B'. Can you explain this answer?
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