3. Circulatory System - Veins Flashcards
1
Q
Function of veins.
A
Take deoxygentaed bloody back to the heart under low pressure.
2
Q
What type of blood to veins carry?
A
Deoxygenated blood because oxygen has been used up by the body cells.
Pulmonary veins carry oxygenated blood to the heart from the lungs.
3
Q
Structure of veins.
A
Wider lumen than equivalent arteries.
Little elastic or muscle tissue.
4
Q
What do the valves do in the vein?
A
Stop the blood flowing backwards.
5
Q
What helps blood flow through the veins?
A
Helped by contraction of the body muscles surrounding them.
