Q. No.When an excitatory neurotransmitter is released and binds to a receptor on the postsynaptic membrane, the neurotransmitter:
1. stimulates the flow of K+ ions out of the cell
2. produces an EPSP
3. produces an IPSP
4. stimulates the flow of Cl- ions into the cell
2. produces an EPSP
3. produces an IPSP
4. stimulates the flow of Cl- ions into the cell
When a receptor loses its sensitivity, they are said to be:
1. Summated
2. Transduced
3. Ablated
4. Adaptation
What would be true for the nociceptors?
1. Nociceptors respond to extreme stimuli
2. All nociceptors are located in the skin
3. Nociceptors are involved in noise perception
4. Nociceptor pathways of conduction cannot be inhibited
During accommodation reflex for near vision in the eye there is:
1. increased sympathetic stimulation of iris smooth muscle
2. relaxation of ciliary muscles and lens becomes more spherical
3. increased parasympathetic stimulation leading to relaxation of the ciliary muscles
4. increased parasympathetic stimulation leading to contraction of ciliary muscles
Cataract:
1. is abnormal curvature of cornea
2. is loss of elasticity of the lens
3. occurs often in children
4. involves increased opacity of the lens
A condition in which close objects appear clearly, but far ones don't is called as:
1. Hyperopia
2. Myopia
3. Presbyopia
4. Glaucoma
Identify the incorrect statement regarding rods and cones:
1. Rods are more sensitive to light than cones
2. There are more rods than cones in the retina
3. Cone vision provides higher acuity than rod vision
4. Rods are found primarily in the fovea while cones are more scattered throughout the retina
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Branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron are the:
| 1. | axons | 2. | axon hillocks |
| 3. | axon collaterals | 4. | dendrites |
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Nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical impulses are:
1. association
2. sensory
3. motor
4. interneurons
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In the CNS, myelin sheaths around neurons are formed by:
1. Schwann cells
2. microglia
3. astrocytes
4. oligodendrocytes
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