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Cardiac Muscle Cells in the Atria Are Capable of Contracting

Question 4

Multiple Choice

Cardiac muscle cells in the atria are capable of contracting spontaneously because of a spontaneous depolarization that results from:


A) An inward current through a hyperpolarization-activated channel.
B) Cyclic changes in the activity of Na+,K+-ATPase.
C) Slow leak of Ca++ through the dihydropyridine receptor.
D) Cyclic changes in the activity of the sarcolemmal Ca++ pump.
E) Cyclic changes in the activity of SERCA.

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