cardiac cycle Flashcards
diastole and atrial/ventricular systole
1
Q
what happens in diastole
A
- atria and ventricular muscles relax
- blood will enter the atria via the vena cava and pulmonary vein
- blood flow causes pressure increase in atria
2
Q
what happens in atria systole
A
- atria muscular walls contract increasing pressure further
- causes atrioventricular valves to open and blood flow into ventricles
- ventricles muscular walls relax
3
Q
what happens in ventricular systole
A
- with a short delay
- ventricular muscular walls contract which increase pressure more than atria
- causes atrioventricular valves to close and semilunar valves to open
- blood pushed out of ventricles into arteries (aorta and pulmonary)
4
Q
where is the atrioventricular valves located
A
between aorta and pulmonary vein
5
Q
where is the semilunar valves located
A
between the atria and ventricles
6
Q
how to valves work
A
the valves open when the pressure is higher behind the valve and close when the pressure is lower in front of the valve
