7.4 Cardiac Cycle Flashcards
The stages of the cardiac cycle How to calculate cardiac output
1
Q
What is the cardiac cycle?
A
Sequence of contraction and relaxation of cardiac muscle
2
Q
What are the three main stages of the cardiac cycle?
A
- Stage 1 - Atrial systole
- Stage 2 - Ventricular systole
- Stage 3 - Diastole
3
Q
What happens during atrial systole?
A
- Ventricles relax
- atria contract
- blood flows into ventricles
4
Q
What happens during ventricular systole?
A
Ventricles contract atria relax blood flows into arteries
5
Q
What happens during diastole?
A
Ventricles and atria relax blood flows passively into atria
6
Q
What is cardiac output?
A
Volume of blood pumped by one ventricle in one minute
7
Q
How do you calculate cardiac output?
A
Heart rate x stroke volume
8
Q
What is heart rate?
A
Number of heart beats per minute
9
Q
What is stroke volume?
A
Volume of blood pumped out of left ventricle during ventricular systole
