Muscles are one of those things that most of us take completely for granted, but they're the body's engine. Without our muscles, we couldn't walk or talk -- and our blood would stop flowing.
WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
FEATURED: HUMAN BODY
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The natriuretic peptides are sometimes called the body's "natural diuretics" because they lower the concentration of sodium in the blood.
Back away from that speaker, turn down that iPod and put down that power tool unless you want the ringing in your ears to remain permanent. Sound can hurt you, and that ringing may be the first sign.