Human Body Facts

 BRAIN FACTS

• The human brain is the largest brain of all vertebrates relative to body size
• It weighs about 3.3 lbs. (1.5 kilograms
• The brain makes up about 2 percent of human's body weight.
• The cerebrum makes up about 85 percent of the brain's weight
• It contains about about 86 million nerve cells (neurons) - the "gray matter"
• It contains billions of nerve fibers (axons and dendrites0 - the "white matter"
• These neurons are connected by trillions of connections, or synapses.

  HEART FACTS

• Your adult heart beats about 100,000 times each day.
• Age and fitness level affect your heart rate. 
• Want to know how big your heart is? Make a fist.
• Your heart rate drops while you sleep.Your heart rate drops while you sleep.
• Heart attack symptoms are different in men and women.
• Depression increases your risk for a heart attack.
• Excessive amounts of sitting have been linked to an increased risk of heart disease.

EYE FACTS

The average blink lasts for about 1/10th of a second.

While it takes some time for most parts of your body to warm up to their full potential, your eyes are on their “A game” 24/7.

Eyes heal quickly. With proper care, it only takes about 48 hours for the eye to repair a corneal scratch.

Seeing is such a big part of everyday life that it requires about half of the brain to get involved.

Newborns don’t produce tears. They make crying sounds, but the tears don’t start flowing until they are about 4-13 weeks old.

Doctors have yet to find a way to transplant an eyeball. The optic nerve that connects the eye to the brain is too sensitive to reconstruct successfully.

You blink about 12 times every minute.

Your eyes are about 1 inch across and weigh about 0.25 ounce.

NOSE FACTS

• There are at least 14 different nose types found in humans. 
• Positions of lower and upper lateral cartilages and nasal bones actually define nose shape.
• During sneezing, irritants (that cause sneezing) are expelled at a speed of 100 miles per hour.
• In women, nose grows until the age of 15 to 17 and for men, it is 17 to 19.
• Different people have different sneezing styles and these styles are genetically determined. So, the members of a given family will have similar sneezing styles which will be different than the sneezing styles of other families.

LIPS FACT

• Lips are 100 times more sensitive than your finger tips.
• The lips dry so fast because there are no sweat glands around the area.
• Everyone's lip mark is unique.
• The lips seem pink due to the blood veins in them.
• Our lips lose their plumpness over the years.
• Science claims that kissing allows a biological information exchange and lets you take in the pheromones of your partner.