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