The hormone that stimulates liver cells to release stored glucose is
A. insulin.
B. calcitonin.
C. aldosterone.
D. glucagon.
E. melatonin.
D. glucagon.
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A reasonable estimation of the duration of an action potential is
a. approximately five microseconds. b. approximately five milliseconds. c. approximately five centiseconds. d. approximately five seconds. e. approximately five nanoseconds.
What do hammerhead sharks have in common with goldfish?
A. They both have a cartilaginous skeleton. B. They both have a calcium-enforced skeleton. C. They both have a lateral line system. D. They both have an operculum.
Under which of the following situations would receptor down-regulation most likely occur?
a. The number of G proteins is too high. b. The concentration of a hormone is too high. c. The cell is unable to manufacture cyclic AMP. d. The concentration of a neurotransmitter is too low. e. The number of receptors in the plasma membrane is too low.
The process of forming an internal vesicle and releasing it from the cell is called
A. endocytosis B. exocytosis