PhysioEx Exercise 6 Activity 1

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10/13/22, 4:57 PM PhysioEx Exercise 6 Activity 1 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: Selvana Labib Date: 13 October 2022 Session ID: session-b55c05f7-b320-be36-38a1-82bc2f463748 Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. Experiment Results Predict Questions Stop & Think Questions The cardiac muscle is capable of which of the following? You correctly answered: autorhythmicity. 1 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. 2 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. 3 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. 4 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 not change. 1 Predict Question 2: If you deliver multiple stimuli (20 stimuli per second) to the heart, what do you think will happen? Your answer: wave summation. 2
10/13/22, 4:57 PM PhysioEx Exercise 6 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex6/act1/ 2/3 Experiment Data Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. Review Sheet Results 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: 59 beats/min. 1 Which of the following statements about the contractile activity is true? You correctly answered: The smaller waves represent the contraction of the atria. 2 During which portion of the cardiac muscle contraction is it possible to induce an extrasystole? You correctly answered: during relaxation. 3 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 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 Explain why the larger waves seen on the oscilloscope represent the ventricular contraction. Your answer: The larger waves seen on the oscilloscope represent the ventricular contraction. This is because the ventricular is stronger than the atria. In addition, the ventricular has to pump 1
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