Week 3 Heart Flashcards
What comes right after diastole?
Systole
What is end diastolic volume?
The volume of blood in the ventricle just BEFORE it starts to contract
What is the largest volume of blood in the ventricle during cardiac cycle?
End diastolic volume
Gotta fill it before pushing it out
What is systolic volume?
Volume of blood in ventricle
- just at the end of ejection
- at the end of systole
- just before heart starts to relax
What is the LOWEST volume of blood in the heart?
Systolic volume
What is stroke volume?
The volume of blood EJECTED from the ventricle in one cardiac cycle
What is the equation definition of stroke volume?
EDV - ESV = SV
What is the difference between EDV and ESV?
The amount of blood you pumped out
What is ejection fraction?
A measure we use to talk about how efficiently the heart is working as a pump
A way of measuring what percentage of the volume of blood that was in the heart was pumped out
How to calculate ejection fraction?
SV divide by EDV X 100
What is P in an equation?
Arterial blood pressure
What is Q in an equation ?
Cardiac output
What is cardiac output?
The volume of blood pumped out by the ventricle over some unit of time
Usually minutes
What is the relatively normal cardiac output ?
5L per minute
What does R stand for in an equation?
Total peripheral resistance
What is the equation to determine cardiac output?
HR X SV = CO
If CO goes up, what happens to pressure?
It will go up
Do CO and BP change in the same direction?
Yes
How do we adjust pressure?
By changing cardiac output
If you change heart rate what changes?
CO and blood pressure changes
If you change CO, what changes?
Arterial blood pressure
If you change SV, what changes?
cardiac output
The chief determinant…
Chief determinant of arterial blood pressure is the amount of blood in the arterial side of circulation
What raises blood pressure?
Anything that helps to put more blood into arterial side of circulation or anything that makes it harder to leave the arterial side of circulation.