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Q.

A chemical signal is transmitted across a synapse from:


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a

Dendrite end of one neuron to axon end of next neuron

b

Axon end of one neuron to dendrite end of next neuron

c

Dendrite to cell body of the same neuron

d

Cell body to axon of the same neuron 

answer is B.

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Detailed Solution

Concept: An electrical or chemical signal can be sent from a neuron (or nerve cell) to another neuron or the intended effector cell via a structure called a synapse.
To choose which direction the chemical signal is shown, we must choose the appropriate choice.
A neuron, commonly referred to as a nerve cell, is composed of four distinct components (or regions) .
The first part is the cell body (or soma) . This serves as both the metabolic "control centre" and the "production and recycling facility" of the neuron. For instance, the cell body produces the proteins that make up neurons.
Process structures that extend from the cell body make up the second and third portions of the cell.
An electric charge mechanism transports a nerve impulse from the neuronal axon end to the synapse.
Question ImageIn the synaptic cleft, the electrical impulse is changed into a chemical impulse. Synapses often occur between dendritic ends and axon terminals.
As a result, a chemical signal is sent from the axon end of one neuron to the dendrite end of the following neuron across a synapse.
Thus, the appropriate response choice (2) .
 
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