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Unformatted text preview: March 9, 2011 I. Musculoskeletal System A. Muscle Action B. Skeletal Muscles 1. Anatomy 2. Contraction 3. Control of contractions 4. Whole muscle action- Triceps: brings your forearms down. Originates is scapula and 2 heads in humerus and inserts in ulna. - Biceps (2 heads) originate in scapula (less moveable part). When you make it shorter, it will flex your forearm. Inserts in radius and ulna. Zones/bands: Sarcomere is made up of repeating units called mylofilaments. A band: myosin (stays the same because none of the filaments get shorter) *draw it out and practice *pg. 836 Cardiac muscle and skeletal muscle are not arranaged the same way. Sarcomere cx (figure 39-10a, pg. 838) has multiple axons and myosin 2. How does a sarcomere shorten? Contractcile version of the muscle is called the sarcomere. So, how does a sarcomere shorten? a.)Sliding filament model- fibers slide so area of thin and think filament overlap increases- mylofilament size does not change! b.) When you look at the filament in the beginnig Energy is going to be supplised to ATP. This energy goes to the head part of all the myosin sub units. ATP which is carrying the energy is going to go to that myosin crossbridge. Myosin goes back and forth....
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