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Name: John Trinh

Exercise 5: Cardiovascular Dynamics: Activity 6: Studying the Effect of Stroke Volume on Pump Activity Lab Report

Pre-lab Quiz Results

You scored 100% by answering 5 out of 5 questions correctly.

1. Which of the following variables directly contributes to preload?

You correctly answered: b. venous return

2. Which of the following would not  increase end diastolic volume?

You correctly answered: c. dehydration

3. Increased contractility of the heart results in all but which of the following?

You correctly answered: d. increased end systolic volume

4. Which of the following does not  affect stroke volume?

You correctly answered: d. All of these affect stroke volume.

5. Which of the following is not  equivalent to the others?You correctly answered: c. end diastolic volume

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Experiment Results

Predict Question:

Predict Question: If the pump rate is analogous to the heart rate, what do you think will happen to the rate when you

increase the stroke volume?

Your answer : a. The pump rate will decrease to maintain cardiac output.

Stop & Think Questions:

Why did changing the ending pump volume (ESV) automatically change the stroke volume?You correctly answered: d. The heart intrinsically alters stroke volume to accommodate changes in preload.

The flow has stayed constant with each trial because

You correctly answered: a. cardiac output is equivalent to blood flow.

How does the heart provide for an increase in stroke volume?

You correctly answered: b. by increasing contractility

Experiment Data:

Flow(ml/min)

Rad. L(mm)

Rad. R(mm)

Str. V (ml) Rate(strokes/min)

Press. L(mm Hg)

Press. Dif. R(mm Hg)

5086.8 3.0 3.0 10 508.7 40 40

5086.8 3.0 3.0 20 254.3 40 40

5086.8 3.0 3.0 30 169.6 40 40

5086.8 3.0 3.0 40 127.2 40 40

5086.8 3.0 3.0 50 101.7 40 40

5086.8 3.0 3.0 60 84.8 40 40

5086.8 3.0 3.0 80 63.6 40 40

5086.8 3.0 3.0 100 50.8 40 40

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