National Geographic: The Heart
2m 42s
the heart
human anatomy
The human heart beats up to 3 billion times over an average lifespan. Learn about the anatomy of the heart and how this muscular organ provides life-giving oxygen throughout the body.
0

Comments


Please sign in to write a comment.

Related Clips


hair growth
hair
human anatomy
how the ear works
ear
human anatomy
creating sound
vocal cords
vibration
sound waves
human anatomy
parts of the brain
amygdala
brain
human anatomy
how the eye works
eyeball
human anatomy