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Human Body Facts

Bones & Muscles Facts


Your feet have about a quarter of all the bones in your body
You are born with about 300 bones — and end up with 206
Goosebumps are leftover from when humans had thicker fur
Bone is stronger than steel by weight
The strongest muscle for its size is in your jaw
Shivering is muscles making heat
A knuckle pop is a gas bubble in the joint
The sartorius is the longest muscle in the body
The stapedius is the smallest skeletal muscle
The thumb has one fewer bone than each other finger
The top two neck bones let the head nod and turn
The funny bone is a nerve, not a bone
The soft center of a spinal disc is mostly water
The shoulder blade is held on by muscle
Some bones grow inside tendons
A healing bone first builds a callus
The diaphragm is a dome of muscle under the lungs
Skeletal muscle has slow fibers and fast fibers
Bone adds material where you load it
Your body has three kinds of muscle
Adults have 12 pairs of ribs
Much of your skeleton is rebuilt about every 10 years
Bones and teeth store about 99 percent of your calcium
Nerve signals can travel about 120 meters per second
Bones hold about 85 percent of your phosphorus

Bones & Muscles