2/20/26, 11:45 AM PhysioEx Exercise 6 Activity 1
PhysioEx Lab Report
Exercise 6: Cardiovascular Physiology
Activity 1: Investigating the Refractory Period of Cardiac Muscle
Name: Morris
Date: 20 February 2026
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1 The cardiac muscle is capable of which of the following?
You correctly answered: autorhythmicity.
2 Phase 2 of the cardiac action potential, when the calcium channels remain open and
potassium channels are closed, is called the
You correctly answered: plateau phase.
3 Which of the following is true of the cardiac action potential?
You correctly answered: The cardiac action potential is longer than the skeletal muscle
action potential.
4 The main anatomical difference between the frog heart and the human heart is that the frog
heart has
You correctly answered: a single, fused ventricle.
Experiment Results
Predict Questions
1 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.
2 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.
Stop & Think Questions
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/ 1/3
PhysioEx Lab Report
Exercise 6: Cardiovascular Physiology
Activity 1: Investigating the Refractory Period of Cardiac Muscle
Name: Morris
Date: 20 February 2026
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1 The cardiac muscle is capable of which of the following?
You correctly answered: autorhythmicity.
2 Phase 2 of the cardiac action potential, when the calcium channels remain open and
potassium channels are closed, is called the
You correctly answered: plateau phase.
3 Which of the following is true of the cardiac action potential?
You correctly answered: The cardiac action potential is longer than the skeletal muscle
action potential.
4 The main anatomical difference between the frog heart and the human heart is that the frog
heart has
You correctly answered: a single, fused ventricle.
Experiment Results
Predict Questions
1 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.
2 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.
Stop & Think Questions
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/ 1/3
