In the context of endocrine regulation, permissiveness refers to
a. one hormone enhancing the responsiveness of a target cell to another hormone.
b. the combined action of several hormones acting complementary to one another.
c. the expression of receptors by a cell allowing it to respond to a hormone.
d. the increase in receptor number that occurs on the surface of a target cell during hyposecretionof a hormone .
e. none of these.
A
You might also like to view...
A temporary cell that is no longer useful for development undergoes preprogrammed cell death. During this process,
A. the cell can no longer adhere to other cells. B. the cytoskeleton forms large, complex structures. C. mitochondria merge. D. chromosomes join.
Which of the following does NOT contribute to the longer lasting and more widespread effects observed with sympathetic activation versus parasympathetic activation?
a) Norepinephrine is more slowly removed from synapses than ACh. b) Additional norepinephrine is released from the adrenal gland. c) Greater divergence occurs in sympathetic neural pathways. d) Blood flow to the hypothalamus is decreased when sympathetic activation occurs.
Sympathetic stimulation of cholinergic fibers in the arterioles of skeletal muscle will produce ________.
A. vasodilation B. no effect C. vasoconstriction
Which of the following organ systems faces the greatest physiological challenge in the transitional period after birth?
A) Circulatory system B) Nervous system C) Respiratory system D) Muscular system E) Integumentary system