Q. No.A gymnast is able to balance his body upside down even in total darkness because of
1. Cochlea
2. Vestibular apparatus
3. Tectorial membrane
4. Organ of corti
1. Cochlea
2. Vestibular apparatus
3. Tectorial membrane
4. Organ of corti
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The transparent lens in the human eye is held in its place by
1. Smooth muscles attached to the iris.
2. Ligaments attached to the iris.
3. Ligaments attached to the ciliary body.
4. Smooth muscles attached to the ciliary body.
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Which of the following structures or regions is incorrectly paired with its function?
| 1. | Hypothalamus - Production of releasing hormones and regulation of temperature, hunger and thirst. |
| 2. | Limbic system - Consists of fibre tracts that interconnect different regions of brain; controls movement. |
| 3. | Medulla oblongata - Controls respiration and cardiovascular reflexes. |
| 4. | Corpus callosum - Band of fibres connecting left and right cerebral hemispheres. |
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Nissl bodies are mainly composed of
1. Nucleic acids and SER
2. DNA and RNA
3. Proteins and lipids
4. Free ribosomes and RER
Unmyelinated neurons:
| 1. | are surrounded by Schwann cells and a discontinuous myelin sheath |
| 2. | are surrounded by Schwann cells that do not secrete a myelin sheath |
| 3. | are not surrounded by Schwann cells or a myelin sheath |
| 4. | are surrounded by a discontinuous myelin sheath but no Schwann cells |
The re-establishment of the resting membrane potential after depolarization is primarily due to:
| 1. Sodium potassium pump | 2. Influx of sodium |
| 3. Efflux of potassium | 4. Efflux of sodium |
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The resting axonal membrane is:
| 1. | impermeable to the flux of both sodium and potassium ions |
| 2. | freely permeable to the flux of both sodium and potassium ions |
| 3. | relatively more permeable to the flux of potassium and nearly impermeable to the flux of sodium ions |
| 4. | relatively more permeable to the flux of sodium and nearly impermeable to the flux of potassium ions |
Most sensory receptors function by producing depolarising potentials. Which of the following function by hyperpolarization rather than depolarization?
1. proprioceptors
2. nociceptors
3. olfactory receptors
4. rods and cones
Each time the sodium-potassium pump works, it transports:
1. three sodium ions to the outside and brings two potassium ions to the inside
2. two sodium ions to the outside and brings three potassium ions to the inside
3. three potassium ions to the outside and brings two sodium ions to the inside
4. two potassium ions to the outside and brings two potassium ions to the inside
The autonomic neural system relays impulse from the CNS to:
| I: | skeletal muscles |
| II: | smooth muscles |
| III: | involuntary organs |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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