Lessons

Short 3D lessons on how the body works. Free, no sign-up.

• How the heart pumps — Watch your heart beat, then follow the blood through its four rooms.
• What happens when you breathe — Follow the air from your nose to your lungs, and see the muscle that pulls it in.
• Where your food goes — Follow a bite of food from your mouth through the long, winding tube inside you.
• What DNA is — Cell, chromosome, twisted ladder, and reading a real gene
• Your brain — What each part does, how one neuron fires, and how neurons are made
• Ouch! Touching a hot pan — Your hand lets go before you even feel the burn. Follow the signal through the nerves.
• Body guards: fighting a germ — A germ gets in through a cut. Watch the lymph nodes catch it and send help.
• One drop of blood, the whole trip — Ride one drop of blood from the heart to a toe and back, then out to the lungs.
• Messengers: hormones — Glands drop chemical messages into your blood. Watch adrenaline, insulin and thyroxine ride out to the whole body.