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Standard XII
Biology
How Is the Resting Potential Maintained?
The following...
Question

The following are the parts of a neuron:
a) Axon b) Terminal branches c) Cyton d) Dendrites.
The correct pathway of a nerve impulse through these parts are ________.

A
badc
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B
dcab
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C
bdac
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D
adbc
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Solution

The correct option is B dcab
Dendrites receive impulse from the preceding neuron. They are attached to cyton. Cyton is the cell body of the neuron containing the nucleus surrounded by cytoplasm. This is connected to a long slender fiber called the axon. The axon is connected to thin root-like projections called terminal branches. Hence, the nerve impulse travels through dendrites, cyton, axon and terminal branches. The correct answer is option B.

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Q. Match the following parts of a neuron to their respective functions.
Parts of Neuron Functions
(A) Dendrite (i) Insulates axon
(B) Axon (ii) Recieves impulses
(C) Myelin sheath (iii) Conducts impulses

Q. Rearrange the following in the correct sequence pertaining to what is given within brackets at the end.
(a) Effector Sensory neuron Receptor Motor neuron Stimulus Central nervous system Response (Reflex arc)
(b) Repolarisation Depolarisation Resting (polarised) (during conduction of nerve impulse through a nerve fibre)
(c) Axon endings Nucleus Dendrites Axon Perikaryon Dendron (Neuron structure)
(d) Diencephalon Cerebellum Medulla oblongata Pons Cerebrum mid brain (sequence of parts of human brain).
Q. Suppose the terminal ends of axon are in contact with dendrites of four adjacent neurons, the nerve impulse of the axon will
Q.

Consider the following statements.

1. There are three main parts in a neuron - a cell body, an axon and dendrites.

2. The cytoplasm is thick here and contains granular substances called Nissl's bodies.

3. Branched processes termed dendrites arise from the cell body of a neuron.

4. All neurons have only one axon.

Select the correct answer having a pair of correct characters_____


Q. Which of the following statements about the transmission of the nerve impulse is correct?
(a) A nerve impulse travels from the dendritic end towards the 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.
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Standard XII Biology
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