Biology 9700 · AS & A Level · Cells as the basic units of living organisms

Cells as the basic units of living organisms — practice question

The graph illustrates how blood pressure changes throughout one cardiac cycle. What event is occurring at time X?

  • Aaortic semilunar valve closing; atrium emptying
  • Baortic semilunar valve closing; atrium filling
  • Caortic semilunar valve opening; atrium emptying
  • Daortic semilunar valve opening; atrium filling

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI