I: | The action potential, generated due to the depolarization of the axonal membrane, arrives at the axon terminal. |
II: | Potassium ions enter the synaptic knob. |
III: | Synaptic vesicles are activated and release neurotransmitter in the synaptic cleft. |
IV: | Neurotransmitter binds to the receptor on the post-synaptic membrane. |
What would be true regarding the structure shown in the given figure?
1. | It is a chemical synapse and there is unidirectional transmission of impulse across it. |
2. | It is a chemical synapse and a chemical neurotransmitter is involved in the transmission of impulse across it. |
3. | It is an electrical synapse and it is relatively slower than the chemical synapse. |
4. | It is an electrical synapse, and although faster than the chemical synapse, is rare in human body. |
What causes the movement of the synaptic vesicles towards the membrane during transmission of impulse across a chemical synapse?
1. Sodium | 2. Calcium |
3. cAMP | 4. cGMP |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): | The same neurotransmitter, acetylcholine, may be inhibitory at some places like heart and excitatory elsewhere like alimentary canal. |
Reason (R): | The cells involved in each case have different receptors for ACh that produce different effects. |
In the light of the above statements choose the correct answer from the options given below:
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |