GK QUESTION#3989
Consider the following observations regarding the communication between neurons (synaptic transmission):
1. The microscopic space separating two neurons through which signals pass is termed the synaptic cleft.
2. Presynaptic terminals are responsible for the secretion of neurotransmitters into the synapse.
3. The axon hillock serves as the primary receptor site for incoming signals from the preceding neuron.
Which of the statements provided above are accurate?
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Answer
A. Only 1 and 2 are correct
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Explanation
Only statements 1 and 2 are correct for a chemical synapse. Neurotransmitters are released from presynaptic terminals and cross the synaptic cleft. Postsynaptic receptors commonly occur on dendrites or the cell body; the axon initial segment near the hillock usually initiates action potentials after signal integration.