Select the correct statement about cardiac output. A) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction. B) Decreased venous return will result in increased end diastolic volume. C) If a semilunar valve were partially obstructed, the end systolic volume in the affected ventricle would be decreased. D) Stroke volume increases if end diastolic volume decreases.

The correct statement about cardiac output is A.

Explanation:

Cardiac output refers to the amount of blood the heart pumps through the circulatory system in a minute. The heart rate and stroke volume; the amount of blood put out by the left ventricle of the heart in one contraction determine the cardiac output. In cardiac output, a slow heart rate increases end diastolic volume, stroke volume, and force of contraction.