In the cardiac cycle, valve movements produce sounds that may be listened to with a stethoscope. What produces the first sound after atrial systole in the cardiac cycle?
- A1 and 2
- B1 and 3
- C1 only
- D3 only
Biology 9700 · AS & A Level · The heart
Biology 9700 · AS & A Level · The heart
In the cardiac cycle, valve movements produce sounds that may be listened to with a stethoscope. What produces the first sound after atrial systole in the cardiac cycle?