Cardiac Cycle Flashcards
1
Q
what is the cardiac cycle?
A
a complete sequence of relaxation and contractions
2
Q
what is an heart beat?
A
the sounds made by blood pressure closing the heart valves
3
Q
what are the 3 stages of the cardiac cycle?
A
- Diastole
- ventricular diastole
- atrial systole
4
Q
what happens in Diastole?
A
- Relaxation of the atria and ventricles
- Volume increases
-pressure decreases
5
Q
what happens in ventricular systole?
A
- Contraction forces blood out to the lungs and the body
- volume decreases
- pressure increases
6
Q
what happens in atrial systole?
A
Ventricles contract and push blood out of the aorta and pulmonary artery
7
Q
Formula for cardiac output?
A
Cardiac output (cm3 min-1) = Heart rate (BPM) x stroke volume (cm^3)
