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Physio Ex Exercise 6 Activity 5
Introductory Human Physiology (PHYSO 101)
Modesto Junior College
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PhysioEx Lab Report
Exercise 6: Cardiovascular Physiology Activity 5: Examining the Effects of Various Ions on Heart Rate Name: destiny barraza Date: 21 October 2020 Session ID: session-5f38988f-12e6-dc9d-648b-3fb1f6e5485b
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
Experiment Results
Predict Questions
Stop & Think Question
Which organelle in the cardiac muscle cell stores calcium? You correctly answered: sarcoplasmic reticulum.
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Verapamil is a calcium-channel blocker. Its effects could be described as You correctly answered: negative chronotropic and negative inotropic.
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When the cardiac muscle cell is at rest, where is most of the potassium found? You correctly answered: in the cytosol.
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Resting cardiac muscle cells are most permeable to You correctly answered: potassium.
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Predict Question 1: Because calcium-channel blockers are negative chronotropic and negative inotropic, what effect do you think increasing the concentration of calcium will have on heart rate? Your answer: positive chronotropic, positive inotropic.
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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.
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1 Where in the cardiac muscle cell is most of the sodium normally found? i
Experiment Data Solution Heart Rate (beats/min) ---- 62 Calcium 72 Sodium ~ 34 Potassium ~ 28
You correctly answered: outside of the cell.
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did the results compare with your prediction? Your answer: High potassium ions decrease the resting potential and decrease the pressure of contraction as predicted. Describe how calcium channel blockers are used to treat patients and why? Your answer: In all paths of the action potential, they block the movement of calcium through the channels. Decreased calcium causes decreased peripheral resistance, decreased heart rate, and decreased pressure of contraction.
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Physio Ex Exercise 6 Activity 5
Course: Introductory Human Physiology (PHYSO 101)
University: Modesto Junior College
