The force of contraction of cardiac muscle is typically increased by:
A) An increase in Ca++ extrusion by the Na+-Ca++ antiporter in cardiac muscle.
B) An increase in myosin phosphorylation in cardiac muscle.
C) A decrease in cytosolic [Ca++] in the cardiac muscle.
D) β-Adrenergic stimulation of the cardiac muscle.
E) Recruitment of more cardiac muscle cells.
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
Q3: Relaxation of cardiac muscle typically requires:
A)Myosin light-chain
Q4: Epinephrine increases the force of contraction of
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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