1. Your hardworking heart never takes a break. The fist-sized lump of cardiac muscle beats about eighty times a minute day and night, year after year. You don’t even have to think about it.
2. During your lifetime your heart will beat about 3 billion times and pump about 100 million gallons of blood into your blood vessels.
3. As the layers of smooth muscle lining your blood vessels contract, blood surges forward on its 60,000-mile journey through your body.
4. Blood whizzes through your arteries, traveling at 1 foot per second. But then it puts on the brakes as it squeezes through your super-slender capillaries. Finally, your blood slowly slogs its way back to your heart through your veins.
- Right now your body contains about 6 quarts 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 and Goofy Body facts? Check out my book Moving and Grooving: The Secrets of Muscles and Bones. It’s full of weird, wacky, strange, and surprising information about your body and the bodies of other animals.