Hole's Human Anatomy and Physiology (Shier), 13th Edition

Ph.I.L.S. 4.0 Quizzing :

Ph.I.L.S. 3.0 Quizzing

1
Look at your graph. What was the effect of stretching (from 11 mm) on the amount of tension produced by the contracting heart?
A)the amount of tension increased to a maximum value and then decreased.
B)the amount of tension increased.
C)the amount of tension decreased to a minimum value and then increased.
D)the amount of tension did not change.
2
Look at your graph. At what length was maximum tension recorded from the heart?
A)11 mm
B)13 mm.
C)15 mm.
D)17 mm.
3
At heart lengths less than 15 mm, the amount of thick and thin filament overlap was:
A)greater than that at 15 mm.
B)the same as that at 15 mm.
C)less than that at 15 mm.
4
Assume that the amount of blood passing around the circulatory system increases. If the heart rate remains constant, then the amount of blood returning to the heart would:
A)increase
B)remain constant.
C)decrease.
5
Increasing the amount of blood returning to the heart would:
A)decrease the end diastolic volume.
B)increase the end diastolic volume.
C)not change the end diastolic volume.
6
What happens to the length of the muscle fibers if the end diastolic volume is increased?
A)The muscle fibers will shorten.
B)The muscle fibers will stay the same length.
C)The muscle fibers will lengthen.
7
If stretching increases the amount of tension produced by the heart, what would be the effect of such a stronger contraction on the stroke volume, the amount of blood ejected by the contraction?
A)Increase stroke volume.
B)Decrease stroke volume.
C)Have no effect on stroke volume.
8
According to your graph, what happens to the amount of tension produced by the heart if it is stretched beyond 15 mm?
A)The amount of tension increases.
B)The amount of tension remains constant.
C)The amount of tension decreases.
9
When compared with the situation at a heart length of 15 mm, if the amount of venous blood returning to the heart increases so that the length of the heart increases to 17 mm:
A)the end diastolic volume would be greater, but the stroke volume would be less.
B)the end diastolic volume would be greater, and the stroke volume would also be greater.
C)the end diastolic volume would be smaller, but the stroke volume would be greater.
D)the end diastolic volume would be smaller, and the stroke volume would also be smaller.
10
What strategies are used by the cardiovascular system to insure that cardiac muscles are not over stretched by an increase in the amount of venous blood returning to the heart?
A)Cardiac fibers have limited compliance, so they do not overstretch.
B)The heart rate increases and the end diastolic volume remains within reasonable limits.
C)The atria restrict blood flow and prevent ventricle expansion.
D)The veins contract to restrict blood flow back to the heart.
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