During exercise, the heart rate .
A) decreases slightly, but the contractions are stronger
B) increases proportional to the exertion involved
C) increases to a set "exercise rate"
D) decreases in inverse relation to the exertion involved

Question

Quizplus · Accepted Answer

During exercise, the heart rate increases in proportion to the level of exertion involved to ensure that muscles receive more oxygen and nutrients to meet the increased demand.

During Exercise, the Heart Rate