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.
Correct Answer:
Verified
Q2: Calsequestrin in cardiac muscle:
A)Acts as a high-affinity
Q3: Relaxation of cardiac muscle typically requires:
A)Myosin light-chain
Q4: Epinephrine increases the force of contraction of
Q5: The force of contraction of cardiac muscle
Q6: Contraction of cardiac muscle typically requires:
A)Ca++ influx
Q7: Mutations in the cardiac ryanodine receptor have
Q8: Stretching cardiac muscle results in an increase
Q9: The mechanisms underlying the development of cardiac
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