Inside the Living Body

* The human body is made up of around 100 trillion cells.
* The human brain contains 100 billion neurons (nerve cells) — about as many stars are in the Milky Way Galaxy — and it can generate enough electricity to power a lightbulb for 24 hours.
* The heart pumps 100,000 times per day, sending 8 to 10 pints of blood through about 60,000 miles (96,560 kilometers) of blood vessels.
* A newborn baby’s skeleton has 300 parts. Gradually, these fuse together during childhood to form the 206 bones of an adult. By the time you are 25, this process is complete.
* We change our skin about every 4 weeks. Every minute, we shed as many as 30,000 dead skin cells.
* The human head has around 100,000 hairs. We lose 40 to 100 every day. Each follicle grows around 20 times in a lifetime.
* The combined growth of hair on your head and body totals 100 inches (254 centimeters) a day, making an incredible 7 miles (11 kilometers) of hair a year.
* We breathe an average of 700 million breaths over the course of an average lifetime of 70 years.

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