Vascular Physiology Flashcards
1
Q
Lymphatic System
A
-net exiting of H2O is picked up by lymphatic system
2
Q
Venous Return Influenced By:
A
- distensibility of veins
- pressure gradient
- sympathetic NS
- Skeletal Mm Activity
- Venous Valves
- Cardiac Suction
- Respiratory Activity (inhale cause decrease pressure in chest so blood flows to heart)
3
Q
JVD
A
- tests right side of heart
- distention of jugular veins
- Positive Test=bilateral distention of Vv above clavicle with head elevated to 45*
4
Q
How do capillaries control where blood is directed?
A
- the precapillary sphincters act as local controls to divert blood to needed areas (esp when sympathetic NS is signaling widespread vasoconstriction)
- like during exercise
5
Q
Hepatojugular Reflex
A
- Test right side of heart
- push on liver 20-30 sec to squeeze out blood and see if jugular veins become distended
6
Q
Pressure Application
A
- Arterial side: total pressure=net H2O movement outward
- Venous Side: total pressure=net H2O movement inward
7
Q
CVP
A
- central venous pressure
- Increased CVP: from heart failure when blood can’t leave R atrium, or large blood transfusion
- Decreased: from R atrium contracting with more than normal force, or decreased venous return
8
Q
HP(c)
A
- capillary BP
- hydrostatic pressure on inside of capillary by blood
- increased @ arterial side of cap
- decreased at venous side of cap
-CAUSES H2O TO MOVE OUT OF CAPILLARY
9
Q
HP(if)
A
- interstitial fluid hydrostatic pressure
- pressure of interstitial fluid outside the capillary pushing H2O into cap
(very small pressure)
10
Q
OP(if)
A
- interstitial fluid oncotic pressure
- proteins pull H2O to them
- small amt proteins outside cap to pull H2o out of cap
(very very small pressure)
11
Q
OP(p)
A
- plasma-colloid oncotic pressure
- proteins pull H20 to them
- more proteins in capillary than out so H20 moves into cap
