A single contraction-relaxation cycle in a muscle fiber produces a(n)
A) cramp.
B) twitch.
C) tetanic contraction.
D) action potential.
E) motor unit.
B
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Why are there so many phagocytic cells (in lymph nodes and the liver, for example) associated with the digestive system?
A. They stimulate contractions of the tunica muscularis. B. They stimulate proliferation of stem cells. C. They remove bacteria and other foreign material ingested with food. D. They can transform into other cell types under the appropriate hormonal stimulation. E. They stimulate digestive enzyme production.
The enteroendocrine cells of the intestinal crypts are responsible for producing which intestinal hormones?
a. gastrin and pepsinogen b. bilverdin and bilirubin c. cholecystokinin and secretin d. enterokinase and aminopeptidase
The average capacity of the bladder is approximately 500 mL
a. True b. False Indicate whether the statement is true or false
How is the strength of a stimulus encoded by neurons?
A. by the size of action potentials B. by the frequency of action potentials C. by the duration of action potentials D. by whether the action potential peak is positive or negative