The semilunar valve opens when ventricular pressure exceeds aortic/pulmonary artery pressure, allowing blood flow out, and closes when aortic/pulmonary artery pressure exceeds ventricular pressure, preventing backflow. The atrioventricular valve closes when ventricular pressure exceeds atrial pressure, preventing backflow, and opens when atrial pressure exceeds ventricular pressure, allowing flow into the ventricles.
The semilunar valve opens when ventricular pressure exceeds aortic/pulmonary artery pressure, allowing blood flow out, and closes when aortic/pulmonary artery pressure exceeds ventricular pressure, preventing backflow. The atrioventricular valve closes when ventricular pressure exceeds atrial pressure, preventing backflow, and opens when atrial pressure exceeds ventricular pressure, allowing flow into the ventricles.
| 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:
Atrioventricular valve:
|
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Happening work side heart explain thing simultaneously
Previous card: Blood pressure ventricles contract rises volume fill atria
Up to card list: A-Level Biology OCR A