Researchers have found that enkephalin receptors are upregulated in cocaine addicts when compared to non-users. It is likely that the action of cocaine
A. increases enkephalin's affinity for its receptor.
B. increases enkephalin in the brain.
C. decreases enkephalin in the brain.
D. is an agonist to the enkephalin receptor.
Answer: C
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A. Canaliculus B. Lamella C. Osteon D. Osteocyte E. Trabeculum
Transducin
a. activates adenylyl cyclase resulting in the formation of cAMP. b. activated calcium-activated channels leading to depolarization of the receptor cell. c. activates the messenger pathway leading to an increase in cGMP. d. is found in the inner segment of photoreceptor cells. e. is a G-protein.
The orgasm-emission phase of the male sexual response is stimulated by ________
A) efferent sympathetic signals from the sacral region of the spinal cord B) efferent parasympathetic signals from the lumbar region of the spinal cord C) efferent sympathetic signals from the lumbar region of the spinal cord D) efferent parasympathetic signals from the sacral region of the spinal cord E) efferent somatic signals from the thoracic region of the spinal cord
Which peptide hormone causes the release of insulin from the pancreatic islets?
a. GTP b. CCK c. VIP d. GIP