Cells that respond to peptide hormones usually do so through a sequence of biochemical reactions involving receptor and kinase activation. In order for cells to respond, it is necessary for first and second messengers to communicate
This is possible because ________.
A) peptide hormones are converted by cell membranes enzymes into second messengers
B) G protein acts as the link between first and second messengers
C) the hormone receptor complex moves into the cytoplasm as a unit
D) hormones alter cellular operations through direct stimulation of a gene
B
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A person suffering from carpal tunnel syndrome has lost function of the
A. median nerve. B. radial nerve. C. musculocutaneous nerve. D. ulnar nerve. E. axillary nerve.
The ________ part of the small intestine is the part closest to the stomach.
A. ventral B. dorsal C. medial D. distal E. proximal
All of the following glands are both endocrine and exocrine except
A. the ovaries. B. the testes. C. the adrenal glands. D. the pancreas. E. All of these glands are both endocrine and exocrine.
Which of the following explains the neural mechanism of an erection?
A. It is a somatic reflex mediated predominantly by sympathetic nerve fibers. B. It is an autonomic reflex mediated predominantly by parasympathetic nerve fibers. C. It is an autonomic reflex mediated predominantly by sympathetic nerve fibers. D. It is an exclusively voluntary action mediated by the cerebral cortex. E. It is a somatic reflex mediated predominantly by parasympathetic nerve fibers.