Smooth muscle
A. has a resting membrane potential that is more negative than skeletal muscle fibers.
B. responds in an all-or-none fashion.
C. has fast waves of depolarization.
D. depolarizes when both Na+ and Ca2+ diffuse into the cell.
E. has fast waves of repolarization.
Answer: D
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If the sodium-potassium pump was inhibited by a drug such as digitalis, what would happen to the membrane potential of the cell?
A) The membrane potential would slowly decrease. B) There would be an instant loss of membrane potential. C) There would be an instant decrease followed by an increase in membrane potential. D) The leak channels would be disrupted
A person exposed to hepatitis is given a shot of gamma globulin (an antibody against hepatitis) to keep him from coming down with the disease. This is an example of:
a. natural active immunity b. natural passive immunity c. artificial active immunity d. artificial passive immunity
The head of a phospholipid molecule has a(n) ____________________ charge
Fill in the blank(s) with correct word
The epicardium
A. covers the surface of the heart. B. is known as the fibrous pericardium. C. attaches inferiorly to the diaphragm. D. is also called endocardium. E. lines the walls of the ventricles.