The elbow and knee joints are similar in that their primary motions are:
A) flexion and extension. B) rotation and circumduction.
C) inversion and eversion. D) abduction and adduction.
Answer: A
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Synthesis of neuropeptides differs from that of other neurotransmitters because it
A. takes place on ribosomes in the postsynaptic cell's membrane. B. takes place in the cell bodies of neurons. C. uses amino acids as precursor molecules. D. takes place in the axon terminals of neurons. E. only takes place at synapses outside the central nervous system.
Lymphatic vessels begin in peripheral tissues and ultimately drain into
A) veins. B) peripheral capillary beds. C) arteries. D) the kidneys. E) arterioles.
Carrier-mediated transport
a. involves a specific membrane protein b. always moves substances against a concentration gradient c. always requires energy expenditure d. involves protein channels e. all of these
Conscious initiation of muscle contraction is controlled by
a. the spinal cord b. the brain stem c. the cerebral cortex d. the thalamus e. none of the above