Introduction to Cardiac Physiology Flashcards
1
Q
Double circulatory system
A
Blood flows through the heart twice
LEft side - oxygenated to systemic
Right side - de-oxy to lungs
2
Q
Parallel suply
A
Every tissue bed in the systemic circulation receives fresh blood
Blood flow can be diverted to different parts of the body as demand requires
3
Q
Flow equation
A
Linear speed*cross-sectional area
4
Q
Ohm’s law
A
P diff = P begin-P end = Flow*resistance
5
Q
Poiseulle’s law
A
Resistance = (8nL)/(pir^4)
N-visocity
L-length
r-internal radius of the tube
6
Q
Flow changes
A
INcreases with pressure drop along tube
Increases with the 4th power o radus
Dec with fluid viscosity
Dec with length of the tube
7
Q
Pressure in heart
A
Drops progressively from the aorta to the right atrium
8
Q
CO
A
=HR*stroke volume
=(MAP-CVP)/TPR
