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Questions and Answers
Which of the following factors increases the slope of phase 4 in the SA node and leads to positive chronotropy?
Which of the following factors increases the slope of phase 4 in the SA node and leads to positive chronotropy?
- Acetylcholine
- Parasympathetic activity
- Sympathetic activity (correct)
- Serotonin
What is the effect of Pl-adrenoreceptors on the heart rate?
What is the effect of Pl-adrenoreceptors on the heart rate?
- Decreases heart rate
- No effect on heart rate
- Increases heart rate (correct)
- Stabilizes heart rate
What is the role of c-AMP in the regulation of heart rate?
What is the role of c-AMP in the regulation of heart rate?
- Decreases heart rate
- No effect on heart rate
- Stabilizes heart rate
- Increases heart rate (correct)
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