Cardiac Cycle Flashcards
1
Q
What are the 3 steps of the cardiac cycle?
A
- Atrial Systole
- Ventricular systole
- Cardiac diastole
2
Q
What happens in atrial systole? 6
A
- Atria fill with blood
- Pressure in atria is higher than in ventricles
- AV valves pushed open
- Atria contract simultaneously
- Forces remaining blood into ventricles
- SL valves close
3
Q
In atrial systole are the AV valves open/closed?
A
Open
4
Q
In atrial systole is the pressure higher in atria/ventricles?
A
Atria
5
Q
In atrial systole are the semi lunar valves open/closed?
A
Closed
6
Q
What happens in ventricular systole? 8
A
- Atria relax
- Ventricles contract after slight delay
- Decreases their blood volume
- Pressure is higher than in atria
- AV valves shut
- Pressure in ventricles higher than in pulmonary artery and aorta
- SL valves open
- Blood flows into aorta and pulmonary artery
7
Q
In ventricular systole are the AV valves open/closed?
A
Closed
8
Q
In ventricular systole are the SL valves open/closed?
A
Open
9
Q
In ventricular systole is the pressure higher in the ventricles/atria?
A
Ventricles
10
Q
What happens in cardiac diastole? 4
A
- Ventricles and atria both relax
- Higher pressure in pulmonary artery and aorta
- SL valves close to prevent backflow into ventricles
- Atria start filling again b/c higher pressure in pulmonary vein and vena cava
11
Q
In cardiac diastole are the AV valves open/closed?
A
Open
12
Q
In cardiac diastole are the semi lunar valves open/closed?
A
Closed
