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Human Body Facts

Brain & Mind

61 Facts

Heart & Blood

61 Facts

Bones & Muscles

64 Facts

Senses

31 Facts

Sleep

08 Facts

Longevity

36 Facts

Digestion

12 Facts

Skin

06 Facts

Immune System

06 Facts

Lungs & Breathing

11 Facts

Hormones

04 Facts

Eyes & Vision

05 Facts

DNA & Cells

23 Facts

Teeth & Mouth

02 Facts


Your brain runs almost entirely on glucose at rest
A single neuron can link to thousands of others
You cannot tickle yourself — your brain predicts the touch
Your brain is only about 2% of your body weight
Brain tissue itself cannot feel pain
Skeletal muscle is roughly 30 to 40 percent of body weight
Three tiny ear bones amplify the pressure of sound
The hip is a ball in a socket and the knee is a hinge
The heel bone is the largest bone in the foot
Adult bone marrow is red in some bones and yellow in others
Movable joints are oiled by a thin film of fluid
Joint cartilage has no blood vessels of its own
The tongue is a bundle of muscles with no bone inside
The collarbone is the only long bone set across the body
The jaw is the only skull joint you move on purpose
The Achilles tendon is the strongest tendon
Hands and feet hold about half of your bones
Tendons tie muscle to bone and ligaments tie bone to bone
You have more than 600 skeletal muscles
The gluteus maximus is the largest muscle in the body
Your fingers have no muscles of their own
The hyoid is the only bone that touches no other bone
Your smallest bone is about the size of a grain of rice
The femur is the longest bone in your body
Whole blood is thicker than water

Human Body