Understanding the Human Circulatory System: Arteries, Veins & Heart

Arteries: Arteries are blood vessels that carry oxygenated blood away from the heart to the rest of the body.

Veins: Veins are blood vessels that carry deoxygenated blood back to the heart from the rest of the body.

Capillaries: Capillaries are tiny blood vessels that connect arteries and veins. They allow oxygen and nutrients to be exchanged between the blood and the body's tissues.

The heart: The heart is a muscular organ that pumps blood throughout the body.