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A-Level Biology OCR A

Ventricular P(v Pressure Valve Opens Systole Aorta/Pulm Artery

Front
Identify where each valve opens/closes. Explain why for each.

Orange/yellow – ventricular pressure
Brown/red – aortic pressure
Pink – atrial pressure
Green – ventricular volume
Back

Semilunar valve:
  • Opens during ventricular systole to allow blood to travel thru the aorta/pulm artery because P(v) > P(ao)
  • Closes during diastole to prevent backflow from aorta/pulm artery into ventricle because P(ao) > P(v) in these stages 

Atrioventricular valve:
  • Closes during ventricular systole to prevent backflow from ventricles into atria since P(v) > P(at)
  • Opens during diastole to allow flow from atria to the ventricles because P(at) > P(v)

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