Facts about the human body

This post is much important to know that facts about the parts of the human body

 

BRAIN

The human brain has about 100 billion neurons.

The brain is more active and thinks more at night than day.

One human brain generates more electrical impulses in a single day than all of the world's telephones put together.

EYE

The pupil of the eye has no color at all. It looks black because it opens directly onto the inside of the eye.

The eyeball of a human weighs approximately 28 grams.

The eye has 125 million rods and 7 million cones.

EAR

The average ear grows 0.01 inches in length every year.

TOOTH

The tooth is the only part of the human body that can't repair itself.

MOUTH

A sneeze zooms out of your mouth at 100 miles per hour.

Note:The average human produces a quart of saliva a day or 10,000 gallons in a life time.

FINGER

The slowest growing finger nail is on the thumb and the fastest growing finger nail is on the middle finger.

LUNGS

Your left lung is smaller than your right lung to make room for your heart.

SKIN 

In one square inch of skin there lies 4 yards of nerve fibers, 1300 nerve cells, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.

There are 45 miles of nerves in the shin of a human being. In a year, a person's heart beats 40,000,000 times.

Each square inch of human skin consists of twenty feet of blood vessels. nerve impulses to and from the brain travel as fast as 170 miles per hour.

RED BLOOD CELLS

Two million red blood cells die every second.

ARM

The structural plan of a whale's, a dog's, a bird's and a man's arm are exactly the same.

STOMACH 

Your stomach has to produce a new layer of mucus every two weeks otherwise it will digest itself.

HEART

 In one hour, your heart works hard enough to produce the equivalent energy to raise almost  1ton of weight 1 yard off the ground.

The average human's heart will beat 3,000 million times in their lifetime. The average human will pump 48 million gallons of blood in their lifetime.

Hearts are made of a special kind of muscle that is found in no other part of the human body. This muscle has the power to relax and contract in a rhythm (the lub-dub-lub-dub sound you hear when you listen to your heartbeat ). This expanding and contracting action pumps blood through the body's blood vessels.

Once the human reaches the age of 35, he/she will start losing approximately 7,000 brain cells a day. The cells will never be replaced.