Autonomic Nervous System

Question 1

HEART: S/A NODE (CHRONOTROPHY)- What are the Sympathetic and Parasympathetic events? Which is the Dominant tone?

Answer 1

• Sympathetic- (B1, B2) increases heart rate

- Parasympathetic- (Muscarinic) decreases heart rate**

Question 2

HEART: A/V NODE (DROMOTROPHY)- What are the Sympathetic and Parasympathetic events? Which is the Dominant tone?

Answer 2

• Sympathetic- (B1,B2) increases automaticity and conduction velocity
• Parasympathetic- (M) decreases**

Question 3

HEART: VENTRICLE (INOTROPHY)- What are the Sympathetic and Parasympathetic events? Which is the Dominant tone?

Answer 3

• Sympathetic- (B1, B2) increases contractility, conduction velocity, and automaticity**
• Parasympathetic- n/a