1 5) Summation that results from the cumulative effect of multiple synapses at m
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1 5) Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated A) spatial summation. B) temporal summation. C) inhibition of the impulse D) hyperpolarization E) impulse transmission 16) When a second EPSP (excitatory postsynaptic potential) arrives at a single synapse before the effects of the first have disappeared, what occurs? A) spatial summation B) temporal summation C) inhibition of the impulse D) hyperpolarization E) decrease in speed of impulse transmission 17) Compounds that alter the rate of neurotransmitter release by the presynaptie neuron or change the postsynaptic cell's response to neurotransmitters are called A) anticholinergics. B) cholinergic chemicals C) amines. E) adrenergic chemicals. 18) The buildup of depolarization when EPSPs arrive in rapid succession is called summation A) temporal B) spatial C) electrical D) chemical E) perforal 19) Which of the following is net true regarding the establishment of a neuron's resting potential? A) Chemical and clectrical forces both favor sodium ions entering the cell. B) Electrical forces push sodium ions into the cell. C) The chemical gradient for potassium ions tends to drive them out of the cell. D) lon pumps in the plasma membrane eject sodium ions as fast as they cross the membrane. E) Resting membrane permeability to Na+ is very low 20) Which of the following is true about threshold for an action potential? A) It is more positive than the resting potential. B) Voltage-gated potassium channels begin to close C) Voltage-gated potassium channels begin to open. D) The membrane begins to hyperpolarize. E) Threshold for a typical neuron is approximately-30 mVExplanation / Answer
15. Summation that results from the cumulative effect of multiple synapses at multiple places on the neurons is designated as spatial summation.
(A) spatial summation.
16. When a second EPSP arrives at a single synapse before the effects of the first have disappeared temporal summation occurs.
(B) temporal summation.
17. Compounds that alter the rate of neurotransmitter reduce by the President neuron or change the postsynaptic cells response to neurotransmitters are called neuromodulators.
(D) neuromodulators.
18. The build up of depolarization when EPSPs arrive in rapid succession is called temporal summation.
(A) temporal.
19. The following statement is not true regarding the establishment of neurones resting potential.
(B) Electrical forces push sodium ions into the cell.
20. The true statement of threshold for an action potential is
( A) It is more positive than the resting potential.
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