Control of Cardiac Output Flashcards
What factors contribute to changing CO
SV - increase contractility
HR - sympathetic innervation and efficiency in refill
what is the primary mechanism of controlling CO
The intrinsic control of SV
Increase venous return to the heart
increases contractility due to Frank Starling mechanism
what is the MABP in the aorta
100 mmHg
what is the pressure change between arterial and venous ends of capillaries
35-10 mmHg
mean of 17 mmHg
what is pulsatile flow?
the difference between systolic and diastolic pressure in a vessle
what is compliance
how a vessel deals with changes in internal pressure
non compliant - rigid tubes that resist expansion when pressure increases
How does the compliance of the aorta change with age
less compliant
greater pressure change with same increase in volume
how is MABP calculated
diastolic pressure + 1/3 of systolic pressure
what is resistance directly proportional to
radius
change in pressure
what is resistance inversely proportional to
viscocity
what is the pouiseuille equation for flow
change in pressure/resistance
