Q. No.Which of the following minerals reduces the excitability of nerves and muscles?
1. Potassium
2. Sodium
3. Magnesium
4. Manganese
Consider the following statements:
| I: | The resting axonal membrane is nearly impermeable to sodium ions. |
| II: | Depolarization of the axonal membrane is due to the influx of sodium ions. |
| III: | The size of the action potential, if produced, does not depend on the strength of the stimulus. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
When neuron is resting, which of the following is false with respect to that
| 1. | It is not conducting any impulse |
| 2. | Axonal membrane is more permeable to potassium ions |
| 3. | Axonal membrane won't allow any flow of sodium ions across it |
| 4. | Membrane is impermeable to negatively charged proteins |
Which of the following regions of the brain is incorrectly paired with its function?
| 1. | Medulla oblongata-Homeostatic control |
| 2. | Cerebellum-Language comprehension |
| 3. | Corpus callosum-Communication between the left and right cerebral cortices |
| 4. | Cerebrum-Calculation and contemplation |
Identify the correct statement regarding the sections of the spinal cord shown in the given diagram:
| I: | A and D are part of the grey mater |
| II: | B is motor and C is sensory |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
If the resting membrane of an excitable cell is made permeable to all ions, which of the following is least likely to happen?
1. Efflux of potassium
2. Influx of sodium
3. Influx of chloride
4. Efflux of sodium
Identify the incorrect match:
| 1. | Reticular formation | Gatekeeper to consciousness |
| 2. | Thalamus | Major relay centre in diencephalon for messages to the cortex |
| 3. | Superior colliculi | Part of limbic system for emotional behaviour |
| 4. | Pons | Part of hindbrain having nuclei for control of breathing rate |
| I: | In a neuron, Nissl’s granules are present in dendrites as well as cell body |
| II: | Unmyelinated neurons in peripheral neural system are not enclosed by a Schwann cell |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of potassium ions
1. Pons
2. Hippocampus
3. Cerebellum
4. Hypothalamus
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