Flashcards in Vascular Physiology Deck (11)
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1
Lymphatic System
-net exiting of H2O is picked up by lymphatic system
2
Venous Return Influenced By:
-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
JVD
-tests right side of heart
-distention of jugular veins
-Positive Test=bilateral distention of Vv above clavicle with head elevated to 45*
4
How do capillaries control where blood is directed?
-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
Hepatojugular Reflex
-Test right side of heart
-push on liver 20-30 sec to squeeze out blood and see if jugular veins become distended
6
Pressure Application
-Arterial side: total pressure=net H2O movement outward
-Venous Side: total pressure=net H2O movement inward
7
CVP
-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
HP(c)
-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
HP(if)
-interstitial fluid hydrostatic pressure
-pressure of interstitial fluid outside the capillary pushing H2O into cap
(very small pressure)
10
OP(if)
-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
