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Neurotransmitter

The substance...

Question

The substance that is released at axonal endings to propagate a nervous impulse are called _______ .

A

neurons

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B

neurotransmitters

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C

synapse

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D

effectors

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Solution

The correct option is B neurotransmitters
Neurotransmitters are chemicals that are used to relay, amplify and modulate electrical signals between a neuron and another cell.

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Q. As the impulse reaches the end of an axon, a chemical called ______ is released.

Q. Question 21
Which of the following statements about transmission of nerve impulse is incorrect?

(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

Q. The chemicals released when the electrical impulse reaches the axon ending is called ‘X’. These ‘X’ are present in ‘Y’ located in the ‘Z’. Identify X, Y and Z.

Q. Fill in the blanks with appropriate words.
The nerves carrying impulse messages from the central nervous system to the effectors are called .......... , while those carrying sensory messages to the central nervous system are called ..........

Nerve which carries nerve impulse from a tissue to the central nervous system is called

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