Question

question 9 (2 points)
select the correct statement about cardiac output.
stroke volume increases if end diastolic volume decreases
a slow heart rate increases end diastolic volume, stroke volume, and force of contraction.
decreased venous return will result in increased end diastolic volume.
if a semilunar valve were partially obstructed, the end systolic - volume in the affected ventricle would be decreased.
question 10 (2 points)
what is the expected heart rate when a heart is removed from a living body?
the heart would immediately stop beating
100 beats / minute
50 beats / minute
75 beats / minute
question 11 (2 points)

Explanation:

1. For Question 9: Cardiac output is related to stroke - volume and heart - rate. Decreased venous return leads to decreased end - diastolic volume which in turn affects stroke volume and cardiac output. When venous return is decreased, the end - diastolic volume in the heart is reduced as less blood fills the heart during diastole.
2. For Question 10: A heart removed from a living body is no longer under the influence of the body's regulatory mechanisms. The normal resting heart rate in a living body is around 60 - 100 beats per minute. But when removed, it will not have the normal regulatory input and will have a lower rate. A heart removed from the body typically has a rate around 50 beats per minute.

Answer:

Question 9: Decreased venous return will result in decreased end - diastolic volume in the affected ventricle.
Question 10: 50 beats / minute