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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