AIIMS 2017 Biology Synaptic Transmission MCQ Question
Read the Assertion and Reason carefully to mark the correct option from those given below Assertion Arrival of an impulse at the axon terminal stimulates the release of neurotransmitters in synaptic cleft. Reason These neurotransmitters are responsible for the opening of ion channels.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false
Both Assertion and Reason are false
Correct Answer
Detailed Explanation
Option C is correct because the assertion that the arrival of an impulse at the axon terminal stimulates the release of neurotransmitters into the synaptic cleft is true, while the reason that these neurotransmitters are responsible for the opening of ion channels is false. Neurotransmitters bind to specific receptors on the postsynaptic membrane, which then leads to the opening of ion channels, but they do not directly cause the channels to open.
Option A is incorrect because, although both statements are true, the reason does not correctly explain the assertion. Option B is also incorrect as it states that the reason is not a correct explanation, but it does not address the fact that the reason itself is false. Option D is incorrect since the assertion is indeed true.
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