What are the 3 layers of a blood vessel?
What is the tunica interna made up of?
What is the tunica media made up of?
What is the tunica externa made up of?
Connective tissue, nerve fibers, lymphatics
What are 2 major functions of veins?
blood to heart
determine Venous Return?
Pressure nearest the tissues
Pressure nearest the heart
What is the definition of Central Venous Pressure?
Pressure in the S. Vena Cava which is measured by a catheter
A network of small blood vessels that supply the large blood vessels
What is the value of normal CVP?
0-4 mm Hg
CVP is important because it tells us two things about our system:
Amount of venous return
The ability of our heart to pump that blood into the arterial system
This is the pressure in the veins nearest to the tissues
Mean circulatory pressure
7 mm Hg
When valves don’t work right, pressure builds in the veins causing them to stretch