Name: ib
Exercise 6: Cardiovascular Physiology: Activity 4: Examining the Effects of Chemical Modifiers on Heart Rate Lab Report
Pre-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly.
1. The parasympathetic nervous system releases __________ to affect heart rate.
Your answer : a. norepinephrine
Correct answer: 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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page 1

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 : b. Atropine will decrease 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 did not answer this question.
Correct answer: c. increased force of contraction and decreased heart rate
Experiment Data:
Solution
---Epinephrine
Pilocarpine
Atropine
Digitalis

Heart Rate
62
82
47
72
43

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Post-lab Quiz Results
You scored 75% by answering 3 out of 4 questions

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