Rich in oxygen
Carries oxygen from the lungs to all body cells
Color: Bright red
Route: Lungs → Heart → Body
Low in oxygen
Returns from body cells to the lungs to get oxygenated
Color: Dark blue/purple
Route: Body → Heart → Lungs
4-chambered pump
Left side: Pumps oxygenated blood to body
Right side: Pumps deoxygenated blood to lungs
Role: Maintains continuous circulation