3 Ectopic pacemakers can be caused by excessive leakage of potassium into

3 ectopic pacemakers can be caused by excessive

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3 Ectopic pacemakers can be caused by excessive leakage of potassium into cardiac cells, resulting in pacemakers appearing in abnormal locations in the heart muscle. This hyperkalemia (excess potassium) decreases the resting potential of the cardiac muscle cell. What effect do you think this would have on the force of contraction? You correctly answered: decrease, negative inotropic. 4 Describe the effect that increasing the calcium ions had on the heart in this activity. How well did the results compare with your prediction? Your answer: Because of increasing heart rate and contraction pressure, blood goes faster. My prediction was invalid. 1 Describe the effect that increasing the potassium ions initially had on the heart in this activity. Relate this to the resting membrane potential of the cardiac muscle cell. How well 2
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6/22/2020 PhysioEx Exercise 6 Activity 5 4/4 did the results compare with your prediction? Your answer: High potassium ions decreases the resting potential and decreases the pressure of contractions, as predicted. Describe how calcium channel blockers are used to treat patients and why? Your answer: In all path of 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. 3
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