1. The average red blood cell lives for 120
days.
2. There are 2.5 trillion (give or take) of
red blood cells in your body at any moment. To
maintain this number, about two and a half
million new ones need to be produced every
second by your bone marrow.That's like a new
population of the city of Toronto every second.
3. Considering all the tissues and cells in
your body, 25 million new cells are being
produced each second. That's a little less than
the population of Canada - every second !
4. A red blood cell can circumnavigate
your body in under 20 seconds.
5. Nerve Impulses travel at over 400 km/hr
(249 mi/hr).
6. A sneeze generates a wind of 166 km/
hr (100 mi/hr), and a cough moves out at 100
km/hr (60 mi/hr).
7. Our heart beats around 100,00 times
every day or about 30 million times in a year.
8. Our blood is on a 60,000-mile journey
per day.
9. Our eyes can distinguish up to ten
million colour surfaces and take in more
information than the largest telescope known to
man.
10. Our lungs inhale over two million litres
of air every day, without even thinking. Their
surface area is large enough to cover one side of
a tennis court.
11. We give birth to over 200 billion red
cells every day.
12. When we touch something, we send a
message to our brain at 124 mph
13. We exercise at least 36 muscles when
we smile.
14. We are about 70 percent water.
15. We make around 1 to 1.6 litres of
saliva a day.
16. Our nose is our personal air-
conditioning system: it warms cold air, cools hot
air and filters impurities.
17. In one square inch of our hand we
have nine feet of blood vessels, 600 pain
sensors, 9000 nerve endings, 36 heat sensors
and 75 pressure sensors.
18. We have copper, zinc, cobalt, calcium,
manganese, phosphates, nickel and silicon in our
bodies.
19. It is believed that the main purpose of
eyebrows is to keep sweat out of the eyes.
20. A person can expect to breathe in
about 45 pounds of dust over his/her lifetime.x

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