Human Body Facts for Kids
Surprising facts about your body
Around 60% of the adult human body is made up of water, and your brain and heart are composed of about 73% water.
Human hair grows about 15 cm (six inches) per year on average, and each strand can live for up to seven years before falling out.
The femur, or thigh bone, is the longest and strongest bone in the human body, supporting your entire upper body weight.
Your two kidneys filter all of the blood in your body about 40 times every day, removing waste products and excess water.
Eyelashes act as a natural shield for your eyes, trapping dust and small particles before they can reach the eyeball.
Muscles make up roughly 40 to 50% of your total body weight, and you use over 200 muscles just to take a single step.
Nerve signals can travel at speeds of up to 120 metres per second — that is faster than most motorway speed limits.
Your body produces about two million new red blood cells every single second to replace the ones that wear out.
Tooth enamel is the hardest substance produced by the human body, even tougher than bone.
Your stomach acid is so strong it could dissolve certain metals — it is kept safely inside by the constantly renewed stomach lining.