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

Explanation:

Cardiac output:  The volume of blood the heart pumps via the circulatory system per minute is known as cardiac output.  

Stroke volume : The volume of blood ejected by the left ventricle in one contraction is called or known as stroke volume and it  with  heart rate  defines the cardiac output.

Cardiac output, is :  A slow heart rate increases end diastolic volume, stroke volume, and force of contraction.

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