A) 1, 2, 3
B) 3, 4, 5
C) 4, 5, 6
D) 5, 6, 7
Correct Answer: C
Solution :
[c] The parts labelled as 4, 5 and 6 are respectively pre-synaptic membrane, synaptic cleft and post-synaptic membrane. These parts constitute the structure of synapse. A synapse is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another cell (neural or otherwise). Synapses are essential to neuronal function. At a synapse, the plasma membrane of the signal-passing neuron (the presynaptic neuron) comes into close apposition with the membrane of the target (postsynaptic) cell. Both the presynaptic and postsynaptic sites contain extensive arrays of molecular machinery that link the two membranes together and cany out the signaling process. In many synapses, the presynaptic part is located on an axon, but some postsynaptic sites are located on a dendrite or soma.
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