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Q. No.The structural and functional unit of the nervous system is:
1. Axon
2. Dendrite
3. Neuron
4. Synapse
1. Axon
2. Dendrite
3. Neuron
4. Synapse
Subtopic: Nervous System |
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Level 1: 80%+
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The junction between two neurons where the transmission of impulse occurs is called:
1. Synapse
2. Node of Ranvier
3. Axon hillock
4. Neurilemma
1. Synapse
2. Node of Ranvier
3. Axon hillock
4. Neurilemma
Subtopic: Action Potential | Synapse |
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The myelin sheath in the peripheral nervous system is formed by:
1. Microglial cells
2. Astrocytes
3. Oligodendrocytes
4. Schwann cells
1. Microglial cells
2. Astrocytes
3. Oligodendrocytes
4. Schwann cells
Subtopic: Nervous System |
78%
Level 2: 60%+
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The nerve impulse travels fastest in:
1. Non-myelinated fibres
2. Myelinated fibres with small diameter
3. Myelinated fibres with large diameter
4. Unmyelinated fibres with large diameter
1. Non-myelinated fibres
2. Myelinated fibres with small diameter
3. Myelinated fibres with large diameter
4. Unmyelinated fibres with large diameter
Subtopic: Nervous System |
Level 3: 35%-60%
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The polarity of a resting neuronal membrane is maintained mainly by:
1. Diffusion of Ca²⁺ ions
2. Active transport of glucose molecules
3. Passive movement of Cl⁻ ions
4. Active transport of Na⁺ and K⁺ ions
1. Diffusion of Ca²⁺ ions
2. Active transport of glucose molecules
3. Passive movement of Cl⁻ ions
4. Active transport of Na⁺ and K⁺ ions
Subtopic: Origin of Resting Membrane Potential |
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During depolarisation of a nerve fibre:
1. Na⁺ ions move into the cell
2. K⁺ ions move into the cell
3. Na⁺ ions move out of the cell
4. Cl⁻ ions move out of the cell
1. Na⁺ ions move into the cell
2. K⁺ ions move into the cell
3. Na⁺ ions move out of the cell
4. Cl⁻ ions move out of the cell
Subtopic: Action Potential |
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Level 1: 80%+
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The transmission of a nerve impulse across a chemical synapse is carried out by:
1. Direct flow of ions
2. Neurotransmitters
3. Electric current
4. Gap junctions
1. Direct flow of ions
2. Neurotransmitters
3. Electric current
4. Gap junctions
Subtopic: Synapse |
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Level 1: 80%+
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The afferent neurons carry impulses:
1. From receptors to CNS
2. From CNS to effectors
3. Between sensory and motor neurons
4. Within the spinal cord only
1. From receptors to CNS
2. From CNS to effectors
3. Between sensory and motor neurons
4. Within the spinal cord only
Subtopic: Nervous System |
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Level 1: 80%+
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Which of the following statements correctly distinguishes a chemical synapse from an electrical synapse?
1. Chemical synapses have faster transmission due to gap junctions
2. Electrical synapses require neurotransmitters to transmit impulse
3. Both transmit impulse through chemical messengers
4. Chemical synapses allow unidirectional transmission; electrical synapses are bidirectional
1. Chemical synapses have faster transmission due to gap junctions
2. Electrical synapses require neurotransmitters to transmit impulse
3. Both transmit impulse through chemical messengers
4. Chemical synapses allow unidirectional transmission; electrical synapses are bidirectional
Subtopic: Nervous System |
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Which part of the brain controls posture and balance of the body?
1. Cerebrum
2. Medulla oblongata
3. Pons
4. Cerebellum
1. Cerebrum
2. Medulla oblongata
3. Pons
4. Cerebellum
Subtopic: Hind & Mid Brain |
81%
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