Which of these statements concerning cardiac muscle is correct?

Which of these statements concerning cardiac muscle is correct?



a. Cardiac muscle has more sarcoplasmic reticulum than skeletal muscle.
b. Cardiac muscle has a prolonged period of slow repolarization called the plateau phase.
c. Cardiac muscle has a shorter refractory period than skeletal muscle.
d. Depolarization of cardiac muscle occurs when K+ and Na+ diffuse into the cell.
e. all of these are correct





Answer: B


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