Topic 11: Cardiovascular System - Cardiac Output Flashcards
1
Q
What is cardiac output?
A
- volume of blood ejected by each ventricle in 1 min
- mL a min
2
Q
cardiac output formula
A
3
Q
What is Stroke Volume (SV)?
A
- volume ejected by each ventricle per beat
4
Q
What is stroke volume equivalent to?
A
- difference between EDV (end-diastolic volume) and ESV (end-systolic volume)
- EDV-ESV
5
Q
What is end diastolic volume (EDV)?
A
- volume of blood in each ventricle at end of ventricular diastole (=preload)
6
Q
What is the maximum ventricular volume?
A
120 mL
7
Q
What is end systolic volume (ESV)? (2)
A
- volume of blood in each ventricle at the end of ventricular systole (ie. whats left after ejection)
- around 50 mL
8
Q
What is stroke volume equal to?
A
120 ml - 50 ml = 70 ml
9
Q
What is cardiac output equal to per ventricle (in L/min)?
A
- 5.25 L/min
10
Q
what is total blood volume in the body? Why is this significant?
A
- around 5 L
- so total blood volume passes through each ventricle each minute (both circuits every minute!!)
11
Q
How many times more does CO increase with exercise?
A
- 5 times or more
