Drugs that increase the actions of norepinephrine and/or serotonin by keeping them in synapses longer are most likely used to treat
A. clinical depression.
B. multiple sclerosis.
C. Tay-Sachs disease.
D. erectile dysfunction.
Answer: A
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Each kidney contains more than a million "functional units" called ________.
Fill in the blank(s) with the appropriate word(s).
The process by which double-stranded, homologous chromosomes exchange genetic material is known as
A. crossing over, and it occurs in interphase. B. crossing over, and it occurs in mitosis. C. crossing over, and it occurs in meiosis. D. interphase, and it occurs in meiosis. E. interphase, and it occurs in mitosis.
During the fetal period, there is an opening between the right and left atrium called the __________ __________.
Fill in the blank(s) with the appropriate word(s).
Consider the difference between lifting a light pad of paper versus a heavy textbook. The primary way the level of force of muscle contraction is controlled is by
A. activating different regions of the muscle. B. recruiting a different number of motor units. C. activating the motor units at a different frequency. D. altering the number of crossbridges each individual fiber uses.