Interesting Facts about the Human Body

• The thickness of your skin varies from ¹/2 to 6 millimeters, depending on the area of your body.

• The four taste zones on your tongue are bitter (back), sour (back sides), salty (front sides), and sweet (front).

• The five senses are sight, hearing, smell, touch, and taste.

• Your body contains eight pints of blood.

• You use 14 muscles to smile and 43 to frown.

• The strongest muscle of the body is the masseter muscle, which is located in the jaw.

• Muscles normally account for 40 percent of one's body weight.

• There are 230 joints in the body.

• Kids have 20 first teeth. Adults have 32 teeth.

• The small intestines are about 25 feet long.

• The large intestines are five feet long and are three times wider than the small intestines.

• Most people shed 40 pounds of skin in a lifetime.

• Your body is 70 percent water.

• Normal body temperature is 98.6° Fahrenheit.

• When you sneeze, air rushes through your nose at a rate of 100 mph.

• An eyelash lives about 150 days before it falls out.

• Your brain sends messages at the rate of 240 mph.

• About 400 gallons of blood flow through your kidneys in one day.

• You blink your eyes about 20,000 times a day.

  Your heart beats about 100,000 times a day.

• Humans breathe 20 times per minute, more than 10 million times per year and about 700 million times in a lifetime.

• You have about 100,000 hairs on your head.

• There are 10 million nerve cells in your brain.

• Each of your eyes has 120 million rods, which help you see in black and white.

• Each eye has six million cones, which help you see in color.

• One in 12 men is color blind.

• Placed end to end, all your body's blood vessels would measure about 62,000 miles.