How do veins make sure blood keeps moving in only ONE direction?
This type of blood vessel has thin walls to carry blood under low pressure
What is the role of the circulatory system?
This type of blood vessel has THICK walls to transport blood under high pressure.
What is the role of veins?
What is the role of arteries?
Arteries
With the use of VALVES (e.g. tricuspid valve)
Carry blood AWAY from the heart.
Circulate oxygen throughout the body and transport nutrients to cells
Veins
Carry blood BACK to the heart.