Quiz 6 Flashcards
A valuable characteristic of thevascularsystem is that all blood vessels are
Distensible
Distensibility allows vascular system to?
- Accomodate pulsatile output
- Average out the pressure pulsations
____ are 8x more distensible than ______
-Veins
than
-Arteries
pulmonary artery pressures are about ____ of sytemic artery pressures. But are ___ more distensible
- 1/6th
- 6x
The relative volume of blood between the arterial and venous sides of the circulation can vary considerably depending upon:
- Total Blood volume
- intravascular pressures
- C.O.
- Vascular resistance and compliance
What controls the BP?
Arterioles
which vessel in the tunica externa/adventitia layer is thicker than the other?
Veins thicker than Arteries
which layer contains nerves and nutrient capillaries?
Exertna/adventitia
also is the fibrous layer
which layer has endothelial cells/made of smooth endothelium
Intima
what is a venous valve disfunction?
Vericose veins
how many cell thickness is a capillary?
one cell thick
what are termed resistance vessels?
arterioles
highly innervated by autonomic nerves
What are the exchange vessels?
capillaries
mean aortic pressure typically?
90
mean pressure in capillaries
25-30
typical venous return pressure at RA?
0 (zero)
arterial compliance =’s
Change in Volume/Change in pressure
_____ of smooth muscle in arteries reduces their compliance, thereby decreasing arterial blood volume and increasing arterial blood pressure within the arterial system
Contraction
Compliance is also dependant on?
the rate by which the change in volume occurs
What law for figuring out MAP
Ohms law
male % fluids
60%
Female % fluids
55%
what percent of ECF is interstitial fluid? and plasma?
80%
20%
solution causes cells to swell
Hypotonic ( less than 0.9%NS)
causes water to flow out of the cell
Hypertonic (greater than 0.9%NS)
isotonic
0.9%
fluid to treat dehydration?
D5W
