Vascular Physiology Flashcards Preview

Cardio Pulm > Vascular Physiology > Flashcards

Flashcards in Vascular Physiology Deck (11):
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

OP(p)

-plasma-colloid oncotic pressure
-proteins pull H20 to them
-more proteins in capillary than out so H20 moves into cap