BiologyQ51–51 of 61 questions
Page 2 of 2 · English
51
BiologyMediumMCQAIIMS · 1999
Assertion : Transmission of nerve impulse across a synapse is accomplished by neurotransmitters.
Reason : Transmission across a synapse usually requires neurotransmitters because there is a small space,i.e.,synaptic cleft,that separates one neuron from another.
Reason : Transmission across a synapse usually requires neurotransmitters because there is a small space,i.e.,synaptic cleft,that separates one neuron from another.
A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.
Solution
(A) The transmission of nerve impulses across a synapse is mediated by chemical substances known as neurotransmitters.
This is necessary because neurons are not physically continuous; they are separated by a microscopic gap called the synaptic cleft.
When an action potential reaches the presynaptic terminal,it triggers the release of neurotransmitters into the synaptic cleft.
These neurotransmitters diffuse across the cleft and bind to receptors on the postsynaptic membrane,thereby propagating the nerve impulse to the next neuron.
Thus,the Reason correctly explains why neurotransmitters are required for synaptic transmission.
This is necessary because neurons are not physically continuous; they are separated by a microscopic gap called the synaptic cleft.
When an action potential reaches the presynaptic terminal,it triggers the release of neurotransmitters into the synaptic cleft.
These neurotransmitters diffuse across the cleft and bind to receptors on the postsynaptic membrane,thereby propagating the nerve impulse to the next neuron.
Thus,the Reason correctly explains why neurotransmitters are required for synaptic transmission.
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