Thursday, July 21, 2011

Today's Trivia – The Human Body

Once again, the useless but interesting information is all about the amazing human body...

- Fingernails grow faster than toenails.

- Fingerprints serve a function - they provide traction for the fingers to grasp things.

- From the age of thirty, humans gradually begin to shrink in size.

- Human adults breathe about 23, 000 time a day.

- Human hair and fingernails do not continue to grow after death.

- Humans shed and re-grow outer skin cells about every 27 days - almost 1,000 new skins in a lifetime.

- If you are a universal donor your blood group is type O.

- If your mouth was completely dry, you would not be able to distinguish the taste of anything.

- Insulin is produced in the pancreas.

- Iron deficiency causes the most common form of anemia.

- Some people never develop fingerprints at all. Two rare genetic defects, known as Naegeli syndrome and dermatopathia pigmentosa reticularis, can leave carriers without any identifying ridges on their skin.

- Sperm is the smallest single cell in a man’s body.

- The amount of carbon in the human body is enough to fill about 9 000 'lead' pencils.

- The average adolescent girl has 34,000 underdeveloped egg follicles, although only 350 or so mature during her life (at the rate of about one per month).

- The average height of a man in the Middle Ages was five feet six inches.

- The average human body contains enough: iron to make a 3 inch nail, sulfur to kill all fleas on an average dog, carbon to make 900 pencils, potassium to fire a toy cannon, fat to make 7 bars of soap, phosphorous to make 2,200 match heads, and water to fill a ten-gallon tank.

- The average human brain weighs 1.3 kg

- The average human produces 25,000 quarts of spit in a lifetime, enough to fill two swimming pools.

- The human body transmits nerve impulses at about 90 meters a second

- The human brain is about 80% water.

- The human head is a quarter of our total length at birth, but only an eighth of our total length by the time we reach adulthood.

- The human wrist contains more bones than the ankle.

- The hydrochloric acid in the human stomach is strong enough to dissolve a nail.

- The Islands of Langerhans won't be found on a map, they're a group of cells located in the pancreas.

- The largest cell in the human body is the female ovum, or egg cell. It is about 1/180 inch in diameter. The smallest cell in the human body is the male sperm. It takes about 175,000 sperm cells to weigh as much as a single egg cell.

- The largest human organ is the skin, with a surface area of about 25 square feet.

- The largest muscle in the human body is the buttock muscle.

- The left lung is smaller than the right lung to make room for the heart.

- The left side of the brain is usually responsible for the control of speech.

- The length of your foot is the same length of your forearm between your wrist and the inside of your elbow.

- The little lump of flesh just forward of your ear canal, right next to your temple, is called a tragus.

- The liver is the largest internal organ weighing about 10.5 kilograms.

- The medical term for a black eye is circumorbital haematoma.

- The most common form of cancer is skin cancer.

- The most sensitive cluster of nerves is at the base of the spine.

- The permanent teeth that erupt to replace their primary predecessors (baby teeth) are called succedaneous teeth.

- The smallest bone in the body is the stirrup bone.

- The tips of fingers and the soles of feet are covered by a thick, tough layer of skin called the stratum corneum.

- There are 60,000 miles of blood vessels in the human body.

- There are four main Blood types: A, B, AB and O and each blood type is either Rh positive or negative.

- There are more living organisms on the skin of a single human being than there are human beings on the surface of the earth.

- There are over 100 million light sensitive cells in the retina.

- There is more pigment in brown eyes than blue.

- There is no single word given to describe the back of the knee.


  1. Interesting that the wrist has more bones than the foot - I wouldn't have thought so.

  2. I was intrigued by the fact that your hair and nails don't continue to grow after you die so I had to look it up because I always heard they do. I found out it is an optical illusion. Your fingers shrink as you decay giving the appearance that your nails are growing, same with your hair. Learn something new everyday!

  3. Me too, Jane. I enjoy reading about the human body. Some things are quite surprising.


    That's very interesting, WebDebris! I always find it fun learning new pieces of usesless - but interesting - information.