How valves work
- Created by: Lauren Brixey
- Created on: 30-10-13 13:40
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Valves ensure blood flows in the correct direction- opened & closed by pressure change
Atrioventricular valves
- When ventricular walls relax & recoil after contraction- pressure in ventricles drops below pressure in atria
- This causes the atroventricular valves to open
- Blood entering the heart flows straight through atria & into ventricles
- Pressure in atria slowly rises as they fill with blood
- Valves remain open while atria contract
Semilunar valves
- When ventricles start to contract- pressure in major arteries is higher than…
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