Stretching cardiac muscle results in an increase in the force of contraction as a result of:
A) Activation of K+ channels.
B) An increase in the sensitivity of actin-myosin interactions to Ca++.
C) Phosphorylation of the ryanodine receptor.
D) Increased phosphorylation of troponin I.
E) Increased Ca++ influx through the Na+-Ca++ antiporter.
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
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
Q9: The mechanisms underlying the development of cardiac
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