Afterload is the pressure the heart generates to eject blood at systole
Heart muscle contractions control stroke volume
Stroke volume is measured during one minute
Preload measures pressure
Force of contraction increases when arterial pressure is below normal
Heart rate increases when arterial pressure is below normal
Vasodilation happens when pressure is above normal
Preload measures pressure in the atria when refilling
Preload happens at the end of diastole when ventricles are fully rested
Faster contractions decrease amount of blood to refill
Afterload is the pressure during ventricle contraction
Cardiac output = stroke volume X heart rate
Preload is the amount the ventricle stretch at the end of diastole
The maximum pressure when ventricles contract is systolic pressure
Diastolic pressure is the lowest pressure in the arteries before ventricular contraction
An adult male stroke volume is about 70 mL
Stroke volume is the volume of blood during a ventricular contraction