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Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.
  • a)
    (i) and (ii)
  • b)
    (ii) and (iii)
  • c)
    (iii) and (iv)
  • d)
    (i) and (iv)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Read the given statements and select the correct ones.(i) Autonomic ne...
Autonomic neural system controls and coordinates such organs which are under involuntary control and unstriated muscles of the body. Unmyelinated nerve fibres have Schwann cells which do not form myelin sheath.
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Most Upvoted Answer
Read the given statements and select the correct ones.(i) Autonomic ne...
Understanding the Statements
To evaluate the correctness of each statement, let's analyze them one by one:
Statement (i): Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
- Analysis: This statement is incorrect. The autonomic nervous system primarily controls involuntary functions and does not transmit impulses to voluntary organs or striated muscles, which are under the control of the somatic nervous system.
Statement (ii): Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
- Analysis: This statement is incorrect. Unmyelinated fibers can have Schwann cells, but they do not form a myelin sheath around the axon. Instead, they are enveloped by the Schwann cells without the formation of a myelin layer.
Statement (iii): Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
- Analysis: This statement is correct. In a resting neuron, the membrane is more permeable to K+ ions due to the presence of more potassium channels, which influences the resting membrane potential.
Statement (iv): A synapse is formed by the membranes of a presynaptic neuron and a postsynaptic neuron.
- Analysis: This statement is correct. A synapse indeed consists of the presynaptic membrane (from the transmitting neuron) and the postsynaptic membrane (of the receiving neuron).
Conclusion
Based on the analyses:
- Correct Statements: (iii) and (iv)
- Therefore, the correct answer is option 'C': (iii) and (iv) are correct.
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Read the given statements and select the correct ones.(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.a)(i) and (ii)b)(ii) and (iii)c)(iii) and (iv)d)(i) and (iv)Correct answer is option 'C'. Can you explain this answer?
Question Description
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