STANDARDZoology-Neural Control and Coordination
STANDARD Zoology Nerve Impulse Transmission Multiple Correct Question
Type: Multiple Correct-conceptual-Medium-Class 11
Which of the following statement are correct and incorrect
- Synaptic cleft of neurons secrete adrenaline
- Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon
- Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath
- Spinal cord and cranial nerves are made of nonmyelinated nerve fibres of the four statements
A
1,2 are correct but 3 and 4 are incorrect
B
1,2 and 3 are correct but 4 is incorrect
C
3 and 4 are correct but 1 and 2 are incorrect
D
2 and 3 are correct while 1 and 4 are incorrect
Correct Answer
Option D
Detailed Explanation
- Synaptic cleft of neurons secrete acetylcholine.
- Myelinated neuron is formed by Schwann cells that function as insulator so that nerve impulse jump from node to node.
- Non-myelinated neuron does not form a myelin sheath. Thus it has slower continuous conduction.
- Spinal cord and cranial nerves are made up of myelinated nerve fibres.
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