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 fibers are slightly stretched,they have a stronger contraction force.
E)If cardiac muscle fibers are slightly stretched,they have a weaker contraction force.

Question

Quizplus · Accepted Answer

Slight stretching of cardiac muscle fibers leads to a stronger contraction force due to the Frank-Starling mechanism, which enhances the heart's pumping efficiency.

Which of the Following Statements Regarding Intrinsic Regulation of the Heart