Cardiac Cycle Flashcards
Cardiac Cycle
what happens during a heartbeat
What happens to blood during diastole phase?
blood is filled up
What does it mean if diastole is shorter than systole? Talk about heart volume and stroke volume
- Heart rate gets faster because it doesn’t have time to fill
- less blood volume so stroke volume decreases
Ventricular Diastole (1st Step)
- atria and ventricles fill up with blood
Atrial Systole (2nd Step)
- atria will contract
- blood is pushed to ventricles
Early Ventricular Systole / Isolvolumteric Contraction Phase (3rd step)
- Ventricles start to contract
- build up pressure in ventricle to make it greater than that of arteries
Early Ventricular Diastole/ Isovolumetric Relaxations (5th step)
- When the blood is pushed out, you need to reduce ventricular pressure
- heart relaxes
Ejection Ventricular Systole (4th Step)
- Once the pressure of ventricles is higher than that or arteries, blood is pushed out
What is the pressure in ventricular diastole?
low ventricular pressure
What happens to volume in diastole?
Goes up
What happens to the ventricular volume in atrial systole? What about pressure?
still goes up and low pressure
What happens to pressure and volume in isolvolumetric contraction?
- volume stays same
- pressure goes up
what happens to volume and pressure in ejection?
- goes down
what happens to volume and pressure in isovolumetric relaxation
- volume remains same
- pressure decreases
Which valves are open and closed during ventricular diastole?
- Bicuspid and Mitral are open
- Pulmonic and Aortic are closed
- note: remains the same in atrial systole?
