Valves Flashcards
1
Q
What causes valves to open and close
A
Pressure
2
Q
Job of the valves
A
Prevent back flow
3
Q
Name the 3 valves
A
- atrioventricular valves
- semi-luna valves
- pocket valves
4
Q
Describe atrioventricular valves
A
- located between atria and ventricles
- prevent back-flow to atria when ventricles contract
- close when pressure higher in ventricles that article
- ensures blood moves to aorta and PA
5
Q
Describe semi-Luna valves
A
- located in aorta and PA
- Prevent back-flow into ventricles
- close when pressure higher in arteries than in ventricles
6
Q
Describe pocket valves
A
- located throughout veins
- prevent back flow when veins squeezed and pressure increased eg muscles contracting
- ensure blood flows back to heart
7
Q
Equation for cardiac output
A
Heart rate x stroke volume
