Red = arteries Blue = veins

  • Red = arteries

  • Blue = veins

Artery
Blood flows away from the heart through blood vessels called arteries. They generally carry oxygen-rich blood, which is bright red.

Vein
Blood flows back to the heart through blood vessels called veins. “Used” blood has a darker color.

Before You Move On

  • 1. Inference Why do you think “used” blood is darker than “fresh” blood?

  • 2. Viewing How does this picture help you understand how veins and arteries transport blood throughout the body?