2.  Movement (voluntary and involuntary)  Bodily functions  There are THREE types of muscle

3.  Involuntary muscle that causes movements within your body.  Involuntary means “not consciously controlled”  Found in walls of esophagus and intestines (help push food through digestive system)  Found in blood vessels, uterus, veins, bladder, walls of stomach

4.  Involuntary muscle that is found ONLY IN THE HEART  Allows your heart to beat and pump blood throughout the body

5.  Muscles that you control to move and perform activities  Skeletal muscles are attached to your bones by tendons (a thick strand of tissue that attaches a muscle to a bone)

6.  Contraction (becoming shorter and thicker)  Muscle fibers (muscle cells) contract when they receive a nerve message to do so  Motor neurons control multiple muscle fibers and receive the message to contract or relax  Your body recruits as many muscle fibers as it needs  Have you ever started to drop something because you thought it was lighter than it was? Then what happened?

9.  Similar to twizzles (reward prize, demonstrate to show muscle)  Concentric contraction- contraction as the muscle fibers shorten (Positive phase in lifting, going against gravity)  Eccentric contraction-greater force lengthens or elongates the muscle fibers as they contract to DECELERATE (negative phase in weight lifting, going with gravity)  Strength training is more effective when it includes both types of contractions

10.  Atrophy: weakening or shrinking of a muscle (often due to lack of use)  Hypertrophy: Enlarging of a muscle  Muscle tone: Slight tension by a few muscle fibers

11. Quadriceps muscle

12. Hamstring