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Nerve Impulse

Acetylcholine...

Question

Acetylcholine is a chemical released when a neuron is stimulated by a sensory signal.

A

True

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B

False

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Solution

The correct option is B
False

The axons of one neuron are connected to the dendrites of another neuron by a fine gap called the synapse.

Acetylcholine is a chemical that is released when an impulse reaches the terminal end of the axon of a nerve cell, irrespective of the signal that stimulates the impulse.

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Q. Which statements about muscle contractions are true?
(i) Acetylcholine is released when neural signal reaches motor end plate
(ii) Muscle contraction is initiated by a signal sent by CNS via a sensory neuron
(iii) During muscle contraction, isotropic band gets elongated
(iv) Repeated activation of the muscle can lead to lactic acid accumulation.

Q. Acetylcholine is a neurotransmitter that is important in the transmission of signals from the motor neurons to the muscles.
Which of the following describes the action of acetylcholine?

Q. Assertion :A neuron chemically communicates with a myocyte by releasing acetylcholine into the myoneural junction. Reason: Acetylcholine diffuses across the nerve-muscle synaptic-cleft and binds to receptors on the sarcolemma which gets depolarized.

Q. Neurons releasing acetylcholine are

Q. Select the correct option:
i) Muscle contraction takes place by sliding of thick filaments over thin filaments.
ii) When the neural signal reaches the neuromuscular junction, it releases acetylcholine, which helps generate an action potential in the muscle fibre.
iii) Muscle contraction begins by a signal sent by the peripheral nervous system by a motor neuron.

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