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Q. No.Which structure of the human brain will form a part of the diencephalon?
1. Cerebral cortex
2. Olfactory bulbs
3. Hypothalamus
4. Pons Varolii
Subtopic: Diencephalon | Fore Brain |
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Identify the incorrect statement:
| 1. | The central nervous system includes the brain and the spinal cord. |
| 2. | The peripheral nervous system comprises of all the nerves of the body associated with the central nervous system. |
| 3. | The afferent nerve fibers transmit regulatory impulses from the central nervous system to the concerned peripheral tissues or organs. |
| 4. | The peripheral nervous system is divided into two divisions called somatic neural system and autonomic neural system. |
Subtopic: Nervous System | Motor Functions of Spinal Cord |
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During the propagation of a nerve impulse, the membrane potential changes in a specific pattern. Which of the following correctly describes the sequence of events in the generation of an action potential?
| 1. | The membrane potential remains constant, indicating a steady state of ion exchange across the neuron membrane. |
| 2. | Sodium ions rapidly enter the neuron, causing the membrane potential to become more negative, followed by the exit of potassium ions which restores the membrane to its resting potential. |
| 3. | Potassium ions rapidly exit the neuron, leading to hyperpolarization first, followed by sodium ions entering the neuron to return to the resting potential. |
| 4. | Sodium ions rapidly enter the neuron, making the inside more positive (depolarization), followed by potassium ions exiting the neuron, which restores the membrane to its resting potential (repolarization). |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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What is a key difference between electrical and chemical synapses?
| 1. | Electrical synapses allow the direct flow of ions from one neuron to another, while chemical synapses involve the release of neurotransmitters. |
| 2. | Chemical synapses can transmit signals faster than electrical synapses. |
| 3. | Electrical synapses involve neurotransmitters, whereas chemical synapses do not. |
| 4. | Chemical synapses are found in the heart, while electrical synapses are found in the brain. |
Subtopic: Synapse |
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The key function of the cerebellum is to:
| 1. | Regulate heart rate and blood pressure. |
| 2. | Control voluntary movements and coordinate fine motor skills. |
| 3. | Control emotions and produce feelings. |
| 4. | Regulate body temperature and water balance. |
Subtopic: Hind & Mid Brain |
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The axoplasm inside the axon contains:
1. Only I and III
2. I, II and III
3. Only II
4. Only I and II
| I: | low concentration of K+ |
| II: | high concentration of negatively charged proteins |
| III: | high concentration of Na+ |
2. I, II and III
3. Only II
4. Only I and II
Subtopic: Action Potential |
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Consider the given two statements:
| Assertion (A): | Myelinated neurons transmit nerve impulses faster than unmyelinated neurons. |
| Reason (R): | Myelinated neurons form electrical synapse wile unmyelinated neurons form chemical synapse. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
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The sodium-potassium pump in neurons:
| 1. | Moves 3 Na+ ions out of the cell and 2 K+ ions into the cell against their concentration gradients. |
| 2. | Moves 2 Na+ ions into the cell and 3 K+ ions out of the cell using ATP. |
| 3. | Does not require ATP to function. |
| 4. | Is involved in the generation of the resting membrane potential. |
Subtopic: Origin of Resting Membrane Potential |
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Match the parts of the brain with their functions:
1. A-iii, B-i, C-ii
2. A-ii, B-iii, C-i
3. A-i, B-ii, C-iii
4. A-iii, B-ii, C-i
| Column-I | Column-II | ||
| A. | Cerebrum | i. | Coordination of movement and balance |
| B. | Cerebellum | ii. | Regulation of heart rate and breathing |
| C. | Medulla oblongata | iii. | Seat of intelligence, memory, and emotions |
1. A-iii, B-i, C-ii
2. A-ii, B-iii, C-i
3. A-i, B-ii, C-iii
4. A-iii, B-ii, C-i
Subtopic: Hind & Mid Brain | Fore Brain |
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| Assertion (A): | Electrical synapses are rarer than chemical synapses in human body. |
| Reason(R): | Electrical synapses are faster than chemical synapses. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Synapse |
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