Science: Interesting facts about human body

* The stomach takes 20 minutes to tell the brain that it is full and one should stop eating.

* The thickness of the skin varies from ½ to 6 mm, depending on the area of your body.

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

* One uses 14 muscles to smile and 43 to frown.

* It takes the interaction of 72 different muscles to produce human speech.

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

* The small intestine is about 750 cm long.

* The large intestine is 150 cm long and 3 times wider than the small intestine.

* Most people shed 20 kg of skin in a lifetime.

* When you sneeze, air rushes through your nose at the rate of 156 kmph.

* An eye lash lives about 150 days before it falls out.

* Our brain sends messages at the rate of 375 kmph.

* About 5-6 litres of blood is filtered by 2 million of nephrons 37 times a day.

* Each of our eyes has 120 M rods, which help us to see in black and white.

* Each eye has 6M cones, which help us see in colour.

* We blink our eyes about 20, 000 times a day.

* Our heart beats about 100, 000 times/day.

* Placed end-to-end all our body’s blood vessels would measure about 90, 000 kms.

* The average human brain has about 100 billion nerve cells.

* The thyroid cartilage is more commonly known as the Adam’s apple.

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