During exercise, what happens to the heart? Choose one: -Cardiac output increases to increase blood delivery to exercising tissues. -Blood flow through the coronary arteries decreases because more blood is moving through the aorta. -HR increases, but there is less time for ventricular filling, so stroke volume and cardiac output decrease. -Stroke volume decreases which leads to a decreased cardiac output.
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Which one of the following is caused by a decrease in venous return to the heart: a decrease in stroke volume and an increase in cardiac output an increase in stroke volume and cardiac output a decrease in stroke volume and cardiac output an increase in stroke volume and a decrease in cardiac output no change in stroke volume and cardiac output
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Heart rate and stroke volume increase with exercise intensity. However, for most individuals, stroke volume stops increasing beyond a certain work intensity (typically between 40-60% Vo2 max). Why is that the case? - End-diastolic volume decreases with higher intensity exercises. - Contractility also stops increasing at that same point. - Afterload on the heart increases significantly with high-intensity exercise.
Cardiac output is the amount of blood pumped by the heart in one minute. Which of these will increase cardiac output? decreased blood volume increased physical activity decreased metabolic activity increased resistance in blood vessels
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