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Physio Cardiac

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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.

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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 Data to record your answer in the lab report. You answered: 59 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 Data to record your answer in the lab report. You answered: 59 beats/min The response that resumed the heartbeat after the vagus nerve stimulation is called You correctly answered: b. vagal escape. Experiment Data:

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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...

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