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A: The cardiac impulse which originates from the SA node in the mammalian heart cannot spread directly from atria to ventricles.
R: In the mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.
  • a)
    If both Assertion & Reason are true, and the reason is the correct explanation of the assertion.
  • b)
    If both Assertion & Reason are true, but the reason is not the correct explanation of the assertion.
  • c)
    If the Assertion is a true statement, but Reason is false.
  • d)
    If both Assertion and Reason are false statements.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A: The cardiac impulse which originates from the SA node in the mammal...
SA node → AV node → Bundle of His → Bundle branch → Purkinje fibre → Ventricle wall
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Most Upvoted Answer
A: The cardiac impulse which originates from the SA node in the mammal...
A and Reason R are true and the Reason is the correct explanation of the Assertion.

Explanation: In the mammalian heart, the SA node is responsible for initiating the cardiac impulse. This impulse then travels through the atria, causing them to contract. However, there is no direct continuity between the cardiac muscle fibers of the atria and those of the ventricles, except for the AV bundles. These AV bundles transmit the impulse from the atria to the ventricles, allowing for coordinated contraction. Therefore, Reason R provides the correct explanation for Assertion A.
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A: The cardiac impulse which originates from the SA node in the mammalian heart cannot spread directly from atria to ventricles.R: In the mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.a)If both Assertion & Reason are true, and the reason is the correct explanation of the assertion.b)If both Assertion & Reason are true, but the reason is not the correct explanation of the assertion.c)If the Assertion is a true statement, but Reason is false.d)If both Assertion and Reason are false statements.Correct answer is option 'A'. Can you explain this answer?
Question Description
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