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Statements about the mechanism of muscle contraction are given below.

I.  Acetylcholine is released when the neural signal reaches the motor end plate.

II. Muscle contraction is initiated by a signal sent by CNS  a sensory neuron.

III. During muscle contraction isotropic band gets elongated.

IV. Repeated activation of the muscles can lead to lactic acid accumulation.

Identify the correct statement.

a)

I and IV are correct

b)

I and III are correct

c)

II and III are correct

d)

I, II, and III are correct


Question ID - 4564 | Toppr Answer

Statements about the mechanism of muscle contraction are given below.

I.  Acetylcholine is released when the neural signal reaches the motor end plate.

II. Muscle contraction is initiated by a signal sent by CNS  a sensory neuron.

III. During muscle contraction isotropic band gets elongated.

IV. Repeated activation of the muscles can lead to lactic acid accumulation.

Identify the correct statement.

a)

I and IV are correct

b)

I and III are correct

c)

II and III are correct

d)

I, II, and III are correct

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

The junction between a motor neuron and the sarcolemma of the muscle fiber is called the neuromuscular junction or motor-end plate. A neural signal reaching this junction (motor-end plate) releases a neurotransmitter (acetylcholine) which generates an action potential in the sarcolemma.



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