Whereas dopamine stimulates sexual activity, the neurotransmitter ____ inhibits it, in part by blocking dopamine release
a. testosterone
b. estrogen
c. serotonin
d. estradiol
c
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Which category of substance causes a slowing down of responses, feelings of relaxation, and lower interpersonal inhibitions?
a. depressants c. hormones b. stimulants d. hallucinogens
Which issue cannot currently be treated either surgically or through the use of corrective lenses?
a. Cataracts b. Glaucoma c. Age-related macular degeneration d. Presbyopia
Why are evening people less vulnerable to fatigue?
A. they have high levels of melatonin throughout the day B. they don't waste energy with entrainment C. they have less activity in their suprachiasmatic nucleus D. they have more activity in their suprachiasmatic nucleus
Dr. Blanchard is giving a lecture about the propagation of the action potential. What would she tell the class?
A. That the process of an action potential repeats itself over and over down the length of the axon thanks to the diffusion of sodium ions. B. That the process of an action potential repeats itself over and over down the length of the axon thanks to the diffusion of potassium ions. C. The action potential moves down the length of the axon because all the sodium channels open all at once after the neuron reaches threshold. D. The action potential moves down the length of the axon because all the potassium channels open all at once after the neuron reaches threshold.