CVR13

What are the 3 layers of a blood vessel?
- Tunica interna
- Tunica media
- Tunica externa
What is the tunica interna made up of?
- Endothelium
- Sub-endothelium
What is the tunica media made up of?

Smooth muscle
What is the tunica externa made up of?
- Connective tissue, nerve fibers, lymphatics
- Vasa-vasorum
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

Vasa Vasorum
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

Varicose veins

Author

Bobopudge

74967

Card Set

CVR13

Description

Venous systems

Updated

2011-03-24T14:08:02Z

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