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What are the 3 layers of a blood vessel?
- Tunica interna
- Tunica media
- Tunica externa
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?
- Return blood to heart
- Store blood
What 2 pressures determine Venous Return?
- Pressure nearest the tissues (MCP)
- Pressure nearest the heart (CVP)
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