Question

question:
willa is training for a marathon. as she trains, its likely that her cardiac output is

answer options:
select one of four
staying stable.
increasing.
decreasing.
disappearing.

Explanation:

Marathon training improves cardiovascular fitness. Over time, the heart becomes more efficient, able to pump more blood per beat (increased stroke volume) while maintaining or lowering resting heart rate, leading to an overall increase in cardiac output (the total volume of blood the heart pumps per minute) during activity and at rest.

Answer:

increasing.