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