- 1(current)
Q. No.Identify the correct statements regarding the sequence of events taking place during transmission of impulse across a chemical synapse as shown in the given figure:
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
| 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. |
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
Subtopic: Â Synapse |
 71%
Level 2: 60%+
Hints
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. |
Subtopic: Â Synapse |
 71%
Level 2: 60%+
Hints
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 |
Subtopic: Â Synapse |
 74%
Level 2: 60%+
Hints
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. |
Subtopic: Â Synapse |
 74%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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