stroke volume variables Flashcards
1
Q
helps propel blood forward during diastole
A
elastic recoil of the great arteries
2
Q
how does the aorta maintain the diastolic pressure at 80mmHg
A
by contracting the tunica media
3
Q
how is MAP calculated
A
(2/3 DBP) + (1/3 SBP) or (Q*TPR)
4
Q
frequency of the the SA node, the AV node, and the Purkinje fibers firing
A
100, 50, 30 respectively
5
Q
the three determinants of stroke volume
A
preload (ED sarcomere length), contractility (calcium level), afterload (Art. BP)
6
Q
determinant of preload
A
amount of venous return
7
Q
how is dP/dT measured
A
with difficulty! dP/dT=Contractility: the rate of pressure development during isovolumetric systole in ventricle
8
Q
Starling’s Law
A
fiber length/ ventricular performance is due to preload
