Biology 0610 · IGCSE · Heart

Heart — practice question

What occurs to the heart valves as the ventricles contract?

  • Aatrioventricular valves close; semilunar valves close
  • Batrioventricular valves close; semilunar valves open
  • Catrioventricular valves open; semilunar valves close
  • Datrioventricular valves open; semilunar valves open

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