Which of the Following Statements Regarding Intrinsic Regulation of the Heart

Multiple Choice

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.