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NEET BIOLOGYMedium

Select the correct statement regarding the mechanism of muscle contraction.

A

It is initiated by a signal sent by CNS via sensory neuron.

B

Neurotransmitter generates action potential in the sarcolemma.

C

Increased Ca++ level leads to the binding of calcium with troponin actin filaments.

D

Masking of active site for actin is activated.

Step-by-Step Solution

According to the textbook:

  • Option B is Correct: A neural signal reaching the neuromuscular junction releases a neurotransmitter (Acetylcholine) which generates an action potential in the sarcolemma .
  • Option A is Incorrect: Muscle contraction is initiated by a signal sent by the CNS via a motor neuron, not a sensory neuron .
  • Option C is Incorrect/Imprecise: While increased Ca++ leads to binding with troponin, the text specifies it binds with a subunit of troponin on actin filaments, and the result is the removal of masking . Option B is the direct verbatim process described.
  • Option D is Incorrect: The binding of calcium to troponin removes the masking of active sites for myosin, it does not activate masking .
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