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Questions and Answers
What effect does sympathetic activity have on the SA node discharge rate?
What effect does sympathetic activity have on the SA node discharge rate?
- Has no effect on the rate of SA node discharge
- Decreases the rate of SA node discharge via Beta 2 receptors
- Causes irregular SA node discharge
- Increases the rate of SA node discharge via Beta 1 receptors (correct)
How does parasympathetic stimulation affect the heart rate?
How does parasympathetic stimulation affect the heart rate?
- Speeds up the heart rate by blocking Na+ channels
- Has no effect on the heart rate
- Causes irregular heart rate patterns
- Slows the heart rate by opening K+ channels (correct)
What is the primary mechanism through which sympathetic activity increases the force of cardiac contractility?
What is the primary mechanism through which sympathetic activity increases the force of cardiac contractility?
- Increase in cAMP production via Beta 2 receptors (correct)
- Activation of K+ channels
- Inhibition of Na+ channels
- Decrease in cAMP production via Beta 1 receptors
Which receptor is primarily involved in increasing the rate of SA node discharge due to sympathetic activity?
Which receptor is primarily involved in increasing the rate of SA node discharge due to sympathetic activity?
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How does sympathetic activity affect the delay at the AV node?
How does sympathetic activity affect the delay at the AV node?
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What is the primary effect of parasympathetic stimulation on cardiac pacemaker cells?
What is the primary effect of parasympathetic stimulation on cardiac pacemaker cells?
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