The left and right coronary arteries
A. are interconnected with several high-volume anastomoses allowing for well-perfused alternate blood paths.
B. are functional end arteries because the blockage of one of them leads to tissue death in the area it supplies.
Answer: B
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Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:
a. opening gated channels. b. opening a gated channel through activation of a G protein. c. activation of the adenylyl cyclase system. d. binding to sites and then being endocytized. e. ultimately activating protein kinases.
The relative concentrations of Na+and K+ remain constant during a single action potential despite movement of these ions across the membrane because
A) They cross back immediately through recovery channels. B) They are pumped back across using the Na+/K+ ATPase pump. C) They are forced back across the membrane as the action potential moves away. D) The refractory periods do not end until all ions have been returned to their original areas.
Discuss some of the important factors responsible for the diversity of muscle types
What will be an ideal response?
D cells release ________, which inhibits the release of gastrin
A) inhibin B) ghrelin C) leptin D) somatostatin E) pepsin