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Unformatted text preview: A muscle that bends a body part is called a flexor . A muscle that straightens a body part is called an extensor . The biceps muscle is a ______________. The triceps muscle is a ______________. Use it or Lose it 1 What happens when someone wears a cast for a broken arm? Skeletal muscles around the broken bone become smaller and weaker. Muscles weaken when they are not exercised. Exercised muscles are stronger and larger. Two kinds of exercises increase muscle strength: resistance and aerobic exercise. Muscle injury strain muscle is torn sprain tendon is torn tendinitis inflamed tendon; takes long time to heal Anabolic steroids are drugs that make muscles stronger. Dangers damage the heart, liver, and kidneys cause high blood pressure can cause bones to stop growing 2...
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- Fall '10
- Biology, muscles, one minute