During ventricular systole,

  1. AV valves close and semilunar valves open
  2. AV valves open and semilunar valves close
  3. all valves close
  4. all valves open
Answer

A) AV valves close and semilunar valves open

Pressure closes AV valves and opens semilunar valves. AS & A Level Biology · Topic 8 Transport in Mammals · 8.3 The heart

Biology MCQ · More A Level Biology: Transport in mammals MCQs · Practise