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SA Node Modulation Quiz

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Questions and Answers

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?

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?

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?

Beta 1 receptor Signup and view all the answers

How does sympathetic activity affect the delay at the AV node?

Decreases delay at AV node Signup and view all the answers

What is the primary effect of parasympathetic stimulation on cardiac pacemaker cells?

Opens K+ channels to slow the heart rate Signup and view all the answers

SA Node Modulation Quiz

Choose a study mode

Podcast

Questions and Answers

What effect does sympathetic activity have on the SA node discharge rate?

How does parasympathetic stimulation affect the heart rate?

What is the primary mechanism through which sympathetic activity increases the force of cardiac contractility?

Which receptor is primarily involved in increasing the rate of SA node discharge due to sympathetic activity?

How does sympathetic activity affect the delay at the AV node?

What is the primary effect of parasympathetic stimulation on cardiac pacemaker cells?

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