Control of heart rate Quiz
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5 questions, one answer each
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1. Which structure initiates the wave of excitation in the heart?
- A. AVN
- B. Purkyne tissue
- C. SAN
- D. Bundle of His
2. What happens at the AVN?
- A. The wave is delayed
- B. The wave is initiated
- C. The wave is blocked permanently
- D. The wave jumps to the apex
3. Blood pH falls during exercise. What is the immediate response?
- A. Pressure receptors send impulses to the AVN
- B. Chemoreceptors send more impulses to the cardiac centre in the medulla
- C. The vagus nerve speeds up the heart
- D. The ventricles stop contracting
4. Which nerve slows the heart when blood pressure is too high?
- A. Sympathetic nerve to the AVN
- B. Sympathetic nerve to the ventricles
- C. Motor nerve to the atria
- D. Parasympathetic nerve to the SAN
5. A transplanted heart has no nerve connections yet still beats. Why?
- A. It is neurogenic
- B. It is myogenic, as the SAN initiates the beat
- C. The AVN starts the heartbeat
- D. Chemoreceptors start it