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Nerve Impulse

If neurons ar...

Question

If neurons are not connected and synapse is a gap between them then how stimuli or impulses transfer from one neuron to another.

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Solution

Dendrites present in the nerves cell receives the impulses coming from sensory neurons or other neurons. These impulses are then send to the cell body of neuron.

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Q. A nerve impulse is transmitted from one neuron to another through junctions called synapses. Which one is not part of synapse?

The gap between two neurons is called a

(a) dendrite.

(b) synapse.

(c) axon.

(d) impulse.

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. Which of the following statements are incorrect?
(i) When an impulse travels along a myelinated neuron, it leaps over the myelin sheath from one node to the next.
(ii) At chemical synapse there is continuity between the presynaptic and postsynaptic neurons provided by the gap junctions.
(iii) Neurotransmitters are chemicals that are released from postsynaptic neuron which interact with specific receptors of presynaptic neuron.
(iv) Neurons releasing acetylcholine are described as cholinergic neurons and those releasing noradrenaline are described as adrenergic neurons.
(v) Refractory period is the period after the transmission of an impulse in a nerve fibre in which membrane of the axon regains its ability to transit impulses.

Q. Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?

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