Four fun facts about the muscular system

1. About 40% of the weight is composed of muscles.

2. The muscle in the body that works the hardest is the heart. It can pump two thousand gallons of blood a day, or five quarts a minute.

3. The tiniest muscles and smallest bones in the body are found in the ear.

These eardrum-connected muscles serve to retain the inner ear closed.

4. The strongest muscle in terms of weight is the masseter, which is located in the jaw. It

permits the teeth to shut with a maximum force of 200 pounds for the molars and 55 pounds for the incisors.

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