PhysioEx Exercise 6 Activity 1
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Date
Feb 20, 2024
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3
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10/20/23, 1
:
14 PM
PhysioEx Exercise 6 Activity 1
Page 1 of 3
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/
PhysioEx Lab Report
Exercise 6: Cardiovascular Physiology
Activity 1: Investigating the Refractory Period of Cardiac Muscle
Name: Zane Dodd
Date: 20 October 2023
Session ID: session-7db623c0-25cc-f5b6-15b2-92ec0f17ab69
Pre-lab Quiz Results
You have not completed the Pre-lab Quiz.
Experiment Results
Predict Questions
Stop & Think Questions
Predict Question 1: When you increase the frequency of the stimulation, what do you
think will happen to the amplitude (height) of the ventricular systole wave?
Your answer: The amplitude will increase.
1
Predict Question 2: If you deliver multiple stimuli (20 stimuli per second) to the heart,
what do you think will happen?
Your answer: neither wave summation nor tetanus.
2
Watch the contractile activity from the frog heart on the oscilloscope.
Enter the number of ventricular contractions per minute (from the heart rate display).
You answered: 62 beats/min.
1
Which of the following statements about the contractile activity is true?
Your answer: There is no relationship between the size of the wave and the contraction of
the heart chambers stimulated.
Correct answer: The smaller waves represent the contraction of the atria.
2
During which portion of the cardiac muscle contraction is it possible to induce an
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10/20/23, 1
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PhysioEx Exercise 6 Activity 1
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https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/
Experiment Data
Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
extrasystole?
You correctly answered: during relaxation.
The amplitude of the ventricular systole did not change with the more frequent
stimulation because
You correctly answered: a new contraction could not begin until the relaxation phase.
1
Which of the following do you think contribute to the inability of cardiac muscle to be
tetanized?
You correctly answered: the long refractory period of the cardiac action potential.
2
10/20/23, 1
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14 PM
PhysioEx Exercise 6 Activity 1
Page 3 of 3
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/
Review Sheet Results
You have not completed the Review Sheet.
Given the function of the heart, why is it important that cardiac muscle cannot
reach
tetanus?
You correctly answered: The ventricles must contract and relax fully with each beat to
pump blood.
3
An extrasystole corresponds to
You correctly answered: an extra ventricular contraction.
4
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