Epinephrine increases the force of contraction of cardiac muscle by:
A) Increasing the amount of Ca++ in the SR for release to the cytosol.
B) Increasing the level of myosin light-chain phosphorylation.
C) Inhibiting the ryanodine receptor.
D) Increasing Ca++ extrusion through the sarcolemmal Ca++ pump.
E) Shortening the duration of the action potential.
Correct Answer:
Verified
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
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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