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Assertion : The phase of muscle contraction occurs when myosin binds and releases actin.
Reason : Muscle contraction is initiated by a signal sent by the peripheral nervous system via motor neuron.
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • c)
    If Assertion is true but Reason is false.
  • d)
    If both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Assertion : The phase of muscle contraction occurs when myosin binds a...
The phase of muscle contraction occurs when myosin binds and releases actin. Muscle contraction is initiated by a signal sent by the central nervous system via a motor neuron. A motor neuron along with the muscle fibres connected to it constitutes a motor unit.
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Community Answer
Assertion : The phase of muscle contraction occurs when myosin binds a...
Understanding Muscle Contraction
Muscle contraction is a complex process involving various biochemical interactions, primarily between myosin and actin filaments.
Assertion Explanation
- The assertion states that contraction occurs when myosin binds and releases actin. This is true.
- Myosin heads attach to the actin filaments, forming cross-bridges.
- ATP hydrolysis allows myosin to pull on actin, resulting in contraction.
Reason Explanation
- The reason given is that muscle contraction is initiated by signals from the peripheral nervous system via motor neurons, which is also true.
- When a motor neuron stimulates a muscle fiber, it triggers the release of calcium ions, leading to the contraction process.
Why the Answer is C
- While both the assertion and reason are true, the reason does not directly explain the assertion.
- The assertion focuses on the mechanical aspect of contraction (myosin-actin interaction), while the reason discusses the initiation of the contraction process by neural signals.
Conclusion
- Therefore, the correct answer is option 'C': Assertion is true, but Reason is false.
- The connection between the two statements is not direct, making the reason inadequate as an explanation for the assertion.
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Assertion : The phase of muscle contraction occurs when myosin binds and releases actin.Reason : Muscle contraction is initiated by a signal sent by the peripheral nervous system via motor neuron.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion.b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'C'. Can you explain this answer?
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