Concept explainers
Introduction:
Synapses are the connecting zone or the junctional region between two nerve cells. These regions help in the conduction of the nerve impulses from one neuron to the axon. A synaptic region is generally located between the axon of one neuron and the dendrites of the subsequent one.

Answer to Problem 1DYKB
Correct answer:
The correct answer is option (a) they release neurotransmitters into the synaptic cleft.
Explanation of Solution
Explanation/justification for the correct answer:
Option (a) the axon terminals (of nerve cells) have round knob-like structures called synaptic knobs. These contain secretory vesicles (synaptic vesicles) that release NTs into the synaptic cleft. These NTs are needed for the transmission of nerve impulses from one neuron to another.
Explanation for incorrect answer:
Option (b) The synaptic knobs possess synaptic vesicles. These vesicles transmit the NTs into the subsequent neuron and not back to the synaptic knob. Hence, this is an incorrect option.
Option (c) They conduct graded potentials (action potentials) to the next neuron. Hence, this is an incorrect option.
Option (d) They are located in the axon terminals of a neuron. They conduct nerve impulses to the dendrites of the next one. Hence, this is an incorrect option.
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Chapter 12 Solutions
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