Which statement is correct about atrial systole?
Correct answer: D. Ventricles remain relax while atria contract
- A. Atria relax and ventricles contract
- B. Atria contract and ventricle also contract
- C. Atria and ventricles are relaxed
- D. Ventricles remain relax while atria contract
Explanation
During atrial systole following events occur: • AV valves open • SL valves close • Muscles of atria contract and pump blood to ventricles • Ventricles are relaxed and receive blood from atria.
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