6 Questions
What effect does sympathetic activity have on the SA node discharge rate?
Increases the rate of SA node discharge via Beta 1 receptors
How does parasympathetic stimulation affect the heart rate?
Slows the heart rate by opening K+ channels
What is the primary mechanism through which sympathetic activity increases the force of cardiac contractility?
Increase in cAMP production via Beta 2 receptors
Which receptor is primarily involved in increasing the rate of SA node discharge due to sympathetic activity?
Beta 1 receptor
How does sympathetic activity affect the delay at the AV node?
Decreases delay at AV node
What is the primary effect of parasympathetic stimulation on cardiac pacemaker cells?
Opens K+ channels to slow the heart rate
Test your knowledge of the modulation of pacemaker cells in the sinoatrial node with this quiz. Explore how sympathetic activity, epinephrine, and norepinephrine can affect the rate of SA node discharge and cardiac contractility through the stimulation of specific receptors and signaling pathways.
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