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Home Q & A Board Laboratory Help Upper-Year Courses
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lovethelight lovethelight
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11 years ago
Anyone can help?  I would appreciate it

PhysioEx 9.0  Exercise 6

Activity 5

1.  Describe the efffect that increasing the calcium ions had on the heart?

2.  Describe the effect that increasing the potassium ions initially had on the heart in this activity?  Relate this ti the resting membrane potential of the cardiac muscle cell

3.  Describe how calcium channel blockers are used to treat patients and why?
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11 years ago
1. Modifiers that affect heart rate are chronotropic, and modifiers that affect the force of contraction are
inotropic.

2. The addition of calcium ions to the frog heart increased the heart rate.

3. Calcium channel blockers reduce the force of contraction of the heart which would decrease blood pressure. Additionally, calcium channel blockers reduce the amount of calcium that flows into vascular
smooth muscle which in turn lowers vasomotor tone and decreases peripheral resistance.

4. The initial effect of potassium ion addition was to decrease the heart rate.

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