The Frank-Starling law suggests that during exercise, the
A) flow of blood through the heart speeds up.
B) heart is stretched and contracts more forcefully.
C) veins expand to handle increased blood flow.
D) heart fills to capacity with blood at each beat.
E) valves in veins cannot prevent backflow.

Question

Quizplus · Accepted Answer

The Frank-Starling law states that the more the heart muscle is stretched during filling, the more forcefully it contracts. During exercise, the increased demand for oxygen and nutrients requires the heart to pump more blood, leading to increased filling and stretching of the heart chambers. This results in a more forceful contraction of the heart, enabling it to meet the increased demand for blood supply to the working muscles.

The Frank-Starling Law Suggests That During Exercise, the