Exercising - The Heart
During exercise, your heart can pump up to five times more blood around your body. The amount of blood leaving the heart each time it pumps increases by 10 to 35 percent. Also, the number of times the heart beats perminute can more than double its normal count.
WHEN YOU START TO EXERCISE YOUR BODY INCREASES THE SUPPLY OF OXYGEN ADN ENERGY TO YOUR MUSCLES. IT DOES THIS IN TWO WAYS: YOUR LUNGS WORK HARDER, TAKINGIN MORE OXYGEN, WHICH IS TRANSFERRED TO YOUR BLOODSTREAM; AND YOUR HEART BEATS FASTER, PUMPING MORE OXYGEN-RICH BLOOD TO YOUR MUSCLES. HERE, THE OXYGEN HELPS TO RELEASE THE EXTRA ENERGY NEEDED BY YOUR MUSCLES.
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