Human Body Facts for Kids
Surprising facts about your body
The human heart has four chambers — two atria and two ventricles — that work together to pump oxygenated and deoxygenated blood around the body.
Normal human body temperature is around 37°C (98.6°F), and even a change of just one or two degrees can signal illness.
If the brain is cut off from oxygen for just four to six minutes, permanent brain damage can begin to occur.
Every person has a completely unique set of fingerprints — even identical twins have different fingerprint patterns.
The masseter muscle in your jaw is the strongest muscle in the human body relative to its size, able to exert forces of up to 200 kg.
The gallbladder stores bile produced by the liver and releases it into the small intestine to help digest fats in your food.
Your eyes are almost the same size from birth to death — they are one of the very few parts of your body that do not grow significantly.
Your fingernails and toenails are made from a tough protein called keratin — the same material that makes up your hair.
Your immune system keeps a 'memory' of every illness it has fought, so it can respond much faster if the same germ tries to infect you again.
Hiccups are caused by sudden involuntary spasms of the diaphragm — the dome-shaped muscle beneath your lungs — followed by a rapid closure of your vocal cords.