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Neurons

The extension...

Question

The extension of the cyton of a neuron which carries electrical impulses forward is ___.

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Solution

An axon or nerve fibre, is a long, slender projection of a nerve cell, or neuron, in vertebrates. It typically conducts electrical impulses away from the nerve cell body. A cyton may give rise to many dendrites but never more than one axon.

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Name the following :

(a) Neurons which carry impulses towards brain.

(b) Process of neuron which carries impulses away from cyton.

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.

Electrical impulses travel from cyton to ____________.

Q. Fill in the following blanks with suitable words :
(a) The two examples of effectors are .........and ...........
(b) Our.............system allows us to react to our surroundings. Information from receptors passes along...........neurons to our brain. Our brain sends impulses along..........neurons to our muscles.
(c) A neuron which carries an impulse to the brain is called a ........... neuron.
(d) The neuron which carries a message for action to a muscle or gland is known as a......... neuron.

The neuron which carries nerve impulses from receptors to spinal cord is called sensory neuron.

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