Friday, June 18, 2010

Final Friday Fun: Five Gross and Goofy Body Facts

Yesterday marked the last day of school here, so I'm scaling back on my blog for the summer. Until the new school year begins, I'll only be posting on Mondays.
But before I sign off until September, here's one more set of Gross and Goofy Facts:
  • Most of the time, your heart beats about eighty or ninety times a minute. People who exercise a lot have lower heart rates. The hearts of some Olympic athletes beat just thirty times a minute.
  • Your heart keeps on pumping day and night, year after year. During your lifetime, it will beat about 3 billion times and pump about 100 million gallons (379 million l) of blood through your body.
  • Each beat of your heart pumps about 5 tablespoons (74 milliliters) of blood into your blood vessels. Most of the time, your heart sends out about 2.5 gallons (9.5 l) of blood per minute. But when you exercise, your heart picks up its pace. At top speed, it can pump up to 20 gallons (76 l) per minute.
  • Blood makes up about 7 percent of your body’s total weight. So if you weigh 100 pounds (45 kilograms), the 6 quarts (5.7 liters) of blood circulating through your body weigh about 7 pounds (3 kg).
  • Right now, your body contains about 6 quarts (5.7 l) of blood. About 24 percent of that blood is in your arteries. About 66 percent is in your veins, and about 10 percent is in your capillaries.

  • Looking for more Gross & Goofy Body facts? Check out my book Pump It Up: The Secrets of the Heart and Blood. To find out more about the whole Grosss and Goofy Body series, read this very thorough review from School Library Journal.
    Have a great summer!

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