Human Body — Page 3
The incredible human body
267 facts
Stomach acid is strong enough to dissolve razor blades.
Hydrochloric acid in the stomach has a pH of 1 to 2. It easily breaks down tough proteins and metals, though the…
Humans are the only animals capable of throwing objects with extreme accuracy and speed.
Our uniquely evolved shoulder joints act like a whip, allowing us to store and release energy, which was crucial for…
You have a blind spot in each eye where the optic nerve connects to the retina.
Because there are no light-sensitive cells in this exact spot, your brain automatically fills in the missing…
The average person will walk the equivalent of 3 times around the world in their lifetime.
Based on an average daily step count, humans will take over 100,000 steps every year, accumulating about 115,000…
The human body contains enough fat to make 7 bars of soap.
In addition to fat, the human body also contains enough iron to make a 3-inch nail. This fact highlights the raw…
The human heart creates enough pressure to squirt blood up to 30 feet.
When the left ventricle contracts, it pumps blood out to the entire body with enough force that, if unobstructed, it…
Goosebumps are an evolutionary leftover from when humans had more body hair.
The reflex makes body hairs stand up, which used to trap a layer of warm air for insulation or make our ancestors…
Humans are the only animals that have chins.
Even our closest primate relatives, like chimpanzees and Neanderthals, lack a protruding chin. Scientists believe it…
The human appendix is not a useless organ; it stores good bacteria.
Known as a 'safe house', the appendix protects beneficial gut bacteria. After an illness like diarrhea, it helps…
The human brain is nearly 60% fat.
It is the fattest organ in the human body. This high-fat content is crucial for the myelin sheath, an insulating…
The fastest muscle in the human body is the eye muscle.
The extraocular muscles can dart the eye back and forth in just milliseconds, allowing us to track fast-moving…
The left lung is smaller than the right lung to make room for the heart.
Because the heart is slightly tilted to the left side of the chest, the left lung has only two lobes, while the right…
The cornea is the only tissue in the human body that has no blood vessels.
It must be completely transparent to let light through, so it receives oxygen directly from the air and the aqueous…
The human body is made up of about 7 octillion atoms.
This incredibly massive number (7 followed by 27 zeros) highlights the sheer microscopic complexity and scale of…
The skin is the largest organ of the human body, accounting for about 15% of your total body weight.
It acts as a protective barrier against infections, regulates body temperature, and allows us to have the essential…
It takes your body roughly 12 to 24 hours to completely digest a meal.
After you eat, food travels through the stomach and small intestine, eventually moving to the large intestine where…
The heart generates its own electricity.
The heart beats thanks to electrical impulses generated by the heart itself. This means that, even outside the body…
Fingerprints form at three months of gestation.
The unique patterns of fingerprints begin to develop in the fetus around the 10th week of pregnancy and remain the…
The human brain stops growing in size around age 18, but continues to develop and mature until the mid-20s.
The prefrontal cortex, responsible for decision-making, impulse control, and planning, is one of the last areas of…
The human brain consumes about 20 percent of the body's energy and generates up to 25 watts.
Despite representing only about 2 percent of body weight, the brain is one of the most energy-demanding organs. It…
The human stomach produces a new layer of mucus every two weeks so it does not digest itself.
Gastric acid is strong enough to dissolve meat, but the stomach is protected by a mucus layer that is constantly…
The interstitium was described as a new human organ in 2018.
The interstitium is a network of fluid-filled spaces beneath the skin and surrounding muscles and organs. It may…
The mesentery was reclassified as an organ in 2016.
The mesentery is a fold of tissue that connects the intestines to the abdominal wall. For centuries it was considered…
Dua's layer in the human eye was only discovered in 2013.
Dua's layer is a structure about 15 micrometres thick in the cornea. It is very strong and impervious to air…