Q. No.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
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
The change in membrane potential that returns it to a negative value just after an action potential has changed the membrane potential to a positive value is called as:
| 1. | depolarization | 2. | hyperpolarization |
| 3. | repolarization | 4. | overshoot |
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During the absolute refractory period along an axon membrane of a neuron, __________.
1. the potassium gates are open and K+ is diffusing down its concentration gradient
2. the sodium gates are closed and Na+ us diffusing down it concentration gradient
3. the neuron is unable to respond to a stimulus of any intensity
4. the membrane is most sensitive to stimuli
What is meant by the fact that the nerve impulses are conducted along an axon without decrement?
1. The action potentials are conducted at the same velocity.
2. The action potentials alter the threshold potential
3. The action potentials are conducted without decreasing amplitude
4. The action potentials will be produced by hyperpolariztion.
Electrical synapses differ from the chemical synapse in that they:
1. occur when two cells are joined by integrin proteins
2. are characterized by a synaptic cleft
3. occur between two cells of unequal size
4. require the presence of gap junctions
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The last site in the soma where membrane potentials propagated from synaptic inputs are summated before being transmitted to the axon [often regarded as the point of initiation of action potentials] is known as:
1. postsynaptic membrane of the dendrite
2. cell body
3. axon hillock
4. axon terminal
Cocaine stimulates the synapses of specific neurons that release dopamine and other monoamines, by ______________.
1. inhibiting enzyme inactivation of dopamine or monoamines
2. blocking the dopamine or monoamine reuptake into the presynaptic axon ending
3. mimicking the effects of dopamine or monoamines on the postsynaptic cell
4. facilitating the release of dopamine or monoamines from the presynaptic terminal
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