The muscles of the human body can be categorized into a number of groups which include muscles relating to the head and neck, muscles of the torso or trunk, muscles of the upper limbs, and muscles of the lower limbs.

Do you know that you have more than 640 muscles, which are separated in to two groups- Voluntary           and            Involuntary   muscles.

Voluntary are the muscles that you move whenever you want to do it, like your biceps for example.

Involuntary are the muscles that move without you thinking about it, like the heart. It contracts up to 80 times a minute and doesn’t depend on whether you want it or not.

Now, when you know what muscles are, it’s time for the facts:

  1. The biggest muscle in the human body is the buttock muscle
  2. You use 17 muscles in order to smile, and 43 to frown
  3. When you move you use 200 muscles
  4. The strongest muscle in the human body is located in the jaw and its name is the the masseter muscle
  5. Your muscles are normally around 40-50% of your body weight
  6. Every half a kilo (1 lb) of muscle you gain, your body burns an extra 50 calories a day
  7. The fibers you already know about can support up to 1,000 times their own weight
  8. 75% of the muscle is water
  9. Producing the human speech takes 72 different muscles
  10. The human tongue consists of sixteen separate muscles, not one as many people think.

Something else you should never forget is taking care of your muscles. Make sure you exercise, warm up before challenging your muscles and provide enough protein so they could recover from a tough work out.

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