Definitions & Circulatory System
Blood vessels that carry blood back to the heart
What are veins?
Blood vessels that carry blood away from the heart
What are arteries?
Tiny, thin walled blood vessels that allow the exchange of gases and nutrients between the blood and the cells and are located between arteries and veins
What are capillaries?
Do all veins always carry deoxygenated blood?
What is most of the time but not always. There are some exceptions?