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 can no longer prevent backflow.

Question

Quizplus · Accepted Answer

The Frank-Starling law states that the greater the volume of blood entering the heart (preload), the greater the force of contraction of the heart. During exercise, the heart is stretched due to increased venous return, which results in a more forceful contraction, leading to an increase in cardiac output. Therefore, option B, which states that the heart is stretched and contracts more forcefully, is the correct answer.

The Frank-Starling Law Suggests That During Exercise, the