What changes would be expected in the size of the heart chambers and heart mass of a marathon runner?
A) Both would increase
B) Both would decrease
C) No change would occur
D) The size of the heart chambers would remain normal but the heart mass would increase

Question

Quizplus · Accepted Answer

Marathon runners undergo intense cardiovascular training that leads to an increase in cardiac output. The heart chambers must enlarge to accommodate the increased blood volume, and the heart muscle hypertrophies to pump blood more efficiently. As a result, both the size of the heart chambers and heart mass would increase in a marathon runner.

What Changes Would Be Expected in the Size of the Heart