Read the given statements and select the correct option. (i) Synaptic cleft of neurons secretes adrenaline. (ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. (iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath. (iii) Spinal and cranial nerves are made of non-myelinated nerve fibres
Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect
Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect
A
Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
B
Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect
C
Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
D
Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect
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Solution
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Synaptic vesicles of the synaptic knob secrete neurotransmitter. Spinal nerves and cranial nerves are myelinated nerves.
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Similar Questions
Q1
Read the given statements and select the correct option. (i) Synaptic cleft of neurons secretes adrenaline. (ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. (iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath. (iii) Spinal and cranial nerves are made of non-myelinated nerve fibres
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Q2
Consider the following statements and state true or false. 1. Synaptic cleft of neurons secrete adrenaline. 2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon. 3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath. 4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.
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Q3
Consider the following statements and find out coorect option: (a) Three are two types of axons, namely myelinated and non myelinated (b) Myelinated nerve fibres found in autonomous and the somatic neural systems (c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. (d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier. (e) Unmyelinated nerve fibre found in spinal and cranial nerves (f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.
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Q4
Read the following statements: (i) Saltatory type of present in non-myelinated nerve fibres (axons) only (ii) The nerve impulse generated at a point in the neuron faes resistances at sites where myelin sheath is present (iii) Nodes of Ranvier of axon is exposed to ECF (iv) In myelinated neurons, ion channels and transport pumps are absent in the nodes of Ranvier (v) In myelinated nerve fibre, the nerve impulse travel as a continous wave of depolarisation How many of the statements are correct?
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Q5
Assertion:
A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.
Reason:
An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.