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Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secrete adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.
  • a)
    Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
  • b)
    Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
  • c)
    Statement (iii) and (iv) are correct but statement (i) and (ii) are incorrect
  • d)
    Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrect
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Read the given statements and select the correct option.(i) Synaptic c...
Synaptic vesicles of the synaptic knob secrete neurotransmitter (e.g., adrenaline). Spinal nerves and cranial nerves are myelinated nerves.
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Read the given statements and select the correct option.(i) Synaptic c...
Explanation:

Synaptic cleft and adrenaline secretion:
- The statement that synaptic cleft of neurons secretes adrenaline is incorrect. The synaptic cleft is the gap between two neurons where neurotransmitters are released, not adrenaline.

Myelinated nerve fibres and Schwann cells:
- Myelinated nerve fibres are indeed enveloped with Schwann cells, which form a myelin sheath around the axon. This sheath helps in the faster conduction of nerve impulses.

Non-myelinated nerve fibres and Schwann cells:
- The statement that non-myelinated nerve fibres are enclosed by Schwann cells that do not form a myelin sheath is correct. In this case, Schwann cells partially envelop the axon but do not form a complete myelin sheath.

Spinal and cranial nerves:
- Spinal and cranial nerves are not made of non-myelinated nerve fibres. In fact, they consist of both myelinated and non-myelinated nerve fibres.
Therefore, the correct option is:
Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrect.
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Read the given statements and select the correct option.(i) Synaptic cleft of neurons secrete adrenaline.(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.a)Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrectb)Statements (i), (ii) and (iii) are correct but statement (iv) is incorrectc)Statement (iii) and (iv) are correct but statement (i) and (ii) are incorrectd)Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrectCorrect answer is option 'D'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Read the given statements and select the correct option.(i) Synaptic cleft of neurons secrete adrenaline.(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.a)Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrectb)Statements (i), (ii) and (iii) are correct but statement (iv) is incorrectc)Statement (iii) and (iv) are correct but statement (i) and (ii) are incorrectd)Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrectCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the given statements and select the correct option.(i) Synaptic cleft of neurons secrete adrenaline.(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.a)Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrectb)Statements (i), (ii) and (iii) are correct but statement (iv) is incorrectc)Statement (iii) and (iv) are correct but statement (i) and (ii) are incorrectd)Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrectCorrect answer is option 'D'. Can you explain this answer?.
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