negative inotropic, what effect do you think increasing the concentration of calcium will have on heart rate? Your answer: negative chronotropic, negative inotropic. 1 Predict Question 2: Excess potassium outside of the cardiac cell decreases the resting potential of the plasma membrane, thus decreasing the force of contraction. What effect (if any) do you think it will initially have on heart rate? Your answer: decrease heart rate. 2 Where in the cardiac muscle cell is most of the sodium normally found? You correctly answered: outside of the cell. 1
2/25/2020 PhysioEx Exercise 6 Activity 5 2/4 Solution Heart Rate (beats/min) ---- 61 Calcium 71 Sodium ~ 34 Potassium ~ 28
2/25/2020 PhysioEx Exercise 6 Activity 5 3/4 Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. Review Sheet Results The addition of most of the ions resulted in You correctly answered: an erratic, decreased heart rate. 1 The effect of potassium on the heart is You correctly answered: negative chronotropic, negative inotropic. 2 The ion that had the most pronounced effect on heart rate was You correctly answered: potassium.
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- Spring '16
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