Stretching Cardiac Muscle Results in an Increase in the Force

question 1

Multiple Choice

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.

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