3/17/24, 4:05 PM PhysioEx Exercise 6 Activity 1 PhysioEx Lab Report Exercise 6: Cardiovascular Physiology Activity 1: Investigating the Refractory Period of Cardiac Muscle Date: 17 March 2024 Session ID: session-939f60f5-b2df-d546-2520-215ac073a391 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 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). You answered: 62 beats/min. 2 Which of the following statements about the contractile activity is true? You correctly answered: The smaller waves represent the contraction of the atria. 3 During which portion of the cardiac muscle contraction is it possible to induce an extrasystole? You correctly answered: during relaxation. Experiment Data https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/ 1/3
