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Q. No.The mechanism by which neurotransmitters are released into the synaptic cleft from the presynaptic neuron involves:
1. Simple diffusion
2. Active transport
3. Exocytosis
4. Endocytosis
Subtopic: Â Synapse |
 58%
Level 3: 35%-60%
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How many of the given statements are correct?
| I: | Chemical synapses use neurotransmitters to transmit impulses. |
| II: | Nodes of Ranvier are gaps in the myelin sheath of axons. |
| III: | The occipital lobe is associated with processing visual information. |
| IV: | The temporal lobe is involved in processing auditory information. |
| V: | The spinal cord is responsible for voluntary actions. |
2. 3
3. 4
4. 5
Subtopic: Â Synapse |Â Neuroanatomy |
 58%
Level 3: 35%-60%
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When an action potential abruptly drops from positive to negative, this is because
| 1. | potassium gates are inactivated and sodium gates are opened. |
| 2. | sodium gates are inactivated and potassium gates are opened. |
| 3. | both potassium and sodium gates are inactivated. |
| 4. | both potassium and sodium gates are opened. |
Subtopic: Â Action Potential |
 66%
Level 2: 60%+
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Match List-I with List-II:
Choose the correct answer from the options given below:
| List-I | List-II | ||
| A. | Pons | I. | Provides additional space for Neurons, regulates posture and balance |
| B. | Hypothalamus | II. | Controls respiration and gastric secretions |
| C. | Medulla | III. | Connects different regions of the brain |
| D. | Cerebellum | IV. | Neuro secretory cells |
| 1. | A-III, B-IV, C-II, D-I | 2. | A-I, B-III, C-II, D-IV |
| 3. | A-II, B-I, C-III, D-IV | 4. | A-II, B-III, C-I, D-IV |
Subtopic: Â Nervous System |Â Hind & Mid Brain |Â Fore Brain |
 80%
Level 1: 80%+
NEET - 2024
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Match Column I with Column II:
Codes:
| Column I | Column II | ||
| A | Sensory neurons | P | carry signals from the CNS to effectors (muscles or glands) |
| B | Motor neurons | Q | connect sensory and motor neurons |
| C | Interneurons | R | transmit signals from sensory receptors to the central nervous system |
| A | B | C | |
| 1. | P | Q | R |
| 2. | Q | P | R |
| 3. | R | P | Q |
| 4. | R | Q | P |
Subtopic: Â Nervous System |
 83%
Level 1: 80%+
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The thalamus in human brain is wrapped around a structure which is a major coordinating centre for sensory and motor signalling. Which letter in the given figure shows this structure?
1. a
2. b
3. c
4. d
1. a
2. b
3. c
4. d
Subtopic: Â Fore Brain |
 59%
Level 3: 35%-60%
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With regard to neuronal signaling in the body, which of the following are true?
1. (i) only
2. (ii) only
3. (i), (ii) and (iii)
4. (i) and (ii)
| (i) | Neuronal transmission can be caused by both electrical and chemical stimulation. |
| (ii) | Synapses ultimately result in the production of an electrical current for signal transduction. |
| (iii) | All synapses in humans are electrical and unidirectional. |
2. (ii) only
3. (i), (ii) and (iii)
4. (i) and (ii)
Subtopic: Â Action Potential |
 52%
Level 3: 35%-60%
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In an electrical synapse, how is the nerve impulse transmitted between neurons?
| 1. | By releasing neurotransmitters across the synaptic cleft |
| 2. | Through the direct movement of ions via gap junctions |
| 3. | By synaptic vesicles fusing with the postsynaptic membrane |
| 4. | Through saltatory conduction at the nodes of Ranvier. |
Subtopic: Â Action Potential |Â Synapse |
 53%
Level 3: 35%-60%
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The sodium potassium pump transports:
1. three sodium ions from outside to inside a cell.
2. three sodium ions from inside to outside a cell.
3. two potassium ions from outside to inside a cell.
4. both 2 and 3
1. three sodium ions from outside to inside a cell.
2. three sodium ions from inside to outside a cell.
3. two potassium ions from outside to inside a cell.
4. both 2 and 3
Subtopic: Â Action Potential |
Level 3: 35%-60%
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Depolarisation of axonal membrane is due to influx of sodium ions. |
| Statement II: | Repolarisation of axonal membrane is due to efflux of sodium ions. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 65%
Level 2: 60%+
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