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Which option is correct for conduction o...

Which option is correct for conduction of nerve impulse along chemical synapse?
i. At synapse, the membranes of the pre and postsynaptic neurons are separated by a fluid-filled space called synaptic cleft
ii. Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses
iii. The axon terminals contain vesicles filled with these neurotransmitters
iv. When an impulse arrives at the axon terminal, synaptic vesicles release their neurotransmitters in the synaptic cleft.
v. The released neurotransmitters bind to their specific receptors, present on the pre-synaptic membrane.
vi. Opens ion channels allowing the entry of ions which can generate a new potential in the postsynaptic neuron
vii. The new potential developed is only excitatory

A

i, ii, iii, iv, v and viii

B

i, ii, iii, iv and vi

C

i, iv, v, vi and vii

D

i, ii, iii, iv, v, vi and viii

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct options for the conduction of nerve impulses along a chemical synapse, let's analyze each statement step-by-step: ### Step-by-Step Solution: 1. **Statement i**: "At synapse, the membranes of the pre and postsynaptic neurons are separated by a fluid-filled space called synaptic cleft." - **Analysis**: This statement is correct. The synaptic cleft is indeed the space between the pre-synaptic and post-synaptic membranes. 2. **Statement ii**: "Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses." - **Analysis**: This statement is correct. Neurotransmitters, such as acetylcholine, play a crucial role in transmitting impulses across synapses. 3. **Statement iii**: "The axon terminals contain vesicles filled with these neurotransmitters." - **Analysis**: This statement is correct. The axon terminals have synaptic vesicles that store neurotransmitters. 4. **Statement iv**: "When an impulse arrives at the axon terminal, synaptic vesicles release their neurotransmitters in the synaptic cleft." - **Analysis**: This statement is correct. The arrival of an impulse triggers the release of neurotransmitters into the synaptic cleft. 5. **Statement v**: "The released neurotransmitters bind to their specific receptors, present on the pre-synaptic membrane." - **Analysis**: This statement is incorrect. The receptors for neurotransmitters are located on the post-synaptic membrane, not the pre-synaptic membrane. 6. **Statement vi**: "Opens ion channels allowing the entry of ions which can generate a new potential in the postsynaptic neuron." - **Analysis**: This statement is correct. The binding of neurotransmitters to receptors opens ion channels, allowing ions to flow into the post-synaptic neuron, which can generate a new action potential. 7. **Statement vii**: "The new potential developed is only excitatory." - **Analysis**: This statement is incorrect. The potential developed can be either excitatory or inhibitory, depending on the type of neurotransmitter and receptor involved. ### Conclusion: Based on the analysis: - Correct statements: i, ii, iii, iv, vi - Incorrect statements: v, vii The option that includes the correct statements is: **Option 2: i, ii, iii, iv, vi.**
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