Physioex 9.0 Ex 6 Act 4

Topics: Neurotransmitter, Acetylcholine, Parasympathetic nervous system Pages: 4 (646 words) Published: March 19, 2013
Exercise 6: Cardiovascular Physiology: Activity 4: Examining the Effects of Chemical Modifiers on Heart Rate Lab Report Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly. 1. The parasympathetic nervous system releases __________ to affect heart rate. You correctly answered: d. acetylcholine
2. A cholinergic drug that worked the same as acetylcholine would You correctly answered: c. be an agonist and decrease heart rate. 3. Norepinephrine affects the heart rate by
You correctly answered: a. increasing the rate of depolarization and increasing the frequency of action potentials. 4. The __________ receptor binds norepinephrine and epinephrine. You correctly answered: b. ß-1 adrenergic


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Experiment Results
Predict Question:
Predict Question 1: Pilocarpine is a cholinergic drug, an acetylcholine agonist. Predict the effect that pilocarpine will have on heart rate.
Your answer : b. Pilocarpine will decrease heart rate.
Predict Question 2: Atropine is another cholinergic drug, an acetylcholine antagonist. Predict the effect that atropine will have on heart rate.
Your answer : a. Atropine will increase heart rate.
Stop & Think Questions:
Which of the following is true of epinephrine?
You correctly answered: c. It increases the heart rate and mimics the sympathetic nervous system. The final chemical modifier we will look at is digitalis (also known as digoxin and digitoxin and derived from the foxglove plant). Individuals with weakened hearts need to allow maximum time for venous return and increased stroke volume and would therefore most likely benefit from

You correctly answered: c. increased force of contraction and decreased heart rate Experiment Data:

Heart Rate


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Post-lab Quiz Results
You scored 50% by answering 2 out of 4 questions correctly.
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