| • | Introduction to the Vascular System
The circulatory network that nourishes your body. |
| • | Arteries
Arteries expand to increase blood flow when the heart is working hard. |
| • | Veins
Veins bring blood back to the heart. |
| • | Capillaries
These tiny vessels supply oxygen and nutrients to tissues. |
| • | Blood
The average adult has about 10 pints of blood. |
