Health Fact

Health Fact

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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.

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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 !

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A red blood cell can circumnavigate your body in under 20 seconds.

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.

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Our blood is on a 60,000-mile journey. 6 7 Nerve Impulses travel at over 400 km/hr (25 mi/hr). 8 Our heart beats around 100,00 times every day. 9 Our eyes can distinguish up to one million color surfaces and take in more information than the largest telescope known to man. 10 Our lungs inhale over two million liters of air every day, without even thinking. They are large enough to cover a tennis court. 11 We give birth to 100 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 30 muscles when we smile. 14 We are about 70 percent water. 15 We make one liter 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 40 pounds of dust over his/her lifetime.

Series exploring topical scientific issues.

For centuries scientists have been attempting to come up with an elixir of youth. Now remarkable discoveries are suggesting that aging is something flexible that can ultimately be manipulated.

Horizon meets the scientists who are attempting to piece together why we age and more vitally for all of us, what we can do to prevent it. But which theory will prevail?

Does the 95-year-old woman who smokes two packets of cigarettes a day hold the clue? Do blueberries really delay signs of aging or is it more a question of attitude? Does the real key to controlling how we age lie with a five-year-old boy with an extraordinary aging disease or with a self-experimenting Harvard professor?

Could one of these breakthroughs really see our lives extend past 120 years?
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