Relaxation of cardiac muscle typically requires:
A) Myosin light-chain dephosphorylation.
B) Activation of the ryanodine receptor.
C) Ca++ uptake by the sarcoplasmic reticulum (SR) .
D) Phosphorylation of phospholamban.
E) Activation of the dihydropyridine receptor.
Correct Answer:
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Q1: Cardiac muscle cells in the atria are
Q2: Calsequestrin in cardiac muscle:
A)Acts as a high-affinity
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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