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Exercise 6: Cardiovascular Physiology: Activity 2: Examining the Effect of Vagus Nerve Stimulation Lab Report Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly. 1. The effect of the parasympathetic nervous system on the heart is to You correctly answered: a. decrease the heart rate.
2. The branch of the autonomic nervous system that dominates during exercise is You correctly answered: b. the sympathetic branch.
3. Parasympathetic stimulation reaches the heart through
You correctly answered: d. vagus nerves, which are cranial nerves. 4. The usual pacemaker of the heart
You correctly answered: c. is the sinoatrial node.

02/12/13

page 1

Experiment Results
Predict Question:
Predict Question: What do you think will happen if you apply multiple stimuli to the heart by indirectly stimulating the vagus nerve?
Your answer : c. The heart rate will decrease and the heart will stop. Stop & Think Questions:
1. Watch the contractile activity from the frog heart on the oscilloscope. Enter the number of ventricular contractions per minute (from the heart rate display) in the field below and then click Submit to record your answer in the lab report.

You answered: 61 beats/min
The vagus nerve carries
You correctly answered: a. signals that decrease the heart rate. 3. Enter the number of ventricular contractions per minute (from the heart rate display) in the field below and then click Submit to record your answer in the lab report.

You answered: 61 beats/min
The response that resumed the heartbeat after the vagus nerve stimulation is called You correctly answered: b. vagal escape.
Experiment Data:

02/12/13

page 2

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly. 1. Extreme vagus nerve stimulation affects the heart by
You correctly answered: a. stopping the heart completely.
2. Vagal escape probably involves
You correctly answered: c. sympathetic reflexes.
3. Research shows that,...
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