Which of the following statements regarding intrinsic regulation of the heart is true?

A) Stretching the SA node will decrease generation of action potentials in the node.
B) Decreased venous return increases cardiac output.
C) The heart's pumping effectiveness is greatly influenced by small changes in afterload.
D) If cardiac muscle cells are slightly stretched, they have a stronger contraction force.
E) If cardiac muscle cells are slightly stretched, they have a weaker contraction force.

Question

Fernando Pineda · Accepted Answer

Final Answer : D, Explanation :  The Frank-Starling law of the heart states that within physiological limits, the strength of the heart's systolic contraction is directly proportional to its diastolic expansion, meaning that a slight stretch of cardiac muscle cells leads to a stronger contraction force.

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