ACTIVITY 5 Examining the Effects of Various lons on Heart Rate 1. Describe the effect that increasing the calcium ions had on the heart. How well did the results compare with your prediction? 2. 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 did the results compare with your prediction? 3. Describe how calcium channel blockers are used to treat patients and why.

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