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Unformatted text preview: I. Vertebrate Muscle Types a. Smooth Muscle lines blood vessels organs (cardio system); under autonomic control (involuntary) b. Cardiac Muscle-heart i. Very specialized c. Striated muscle-skeletal muscle i. Under voluntary control II. Skeletal Muscle a. Tissue Pic 1 b. Muscle Fiber Pic 2 i. We arent sure why there is only one NMS ii. One synapse per muscle fiber c. Myofibril i. ~1 micrometer in diameter Picture 3 1. Muscle Contraction: a. Z lines closer together b. I band and h zones get narrows c. A band remains the same III. Sliding Filament (Figure 49.28, 29 a. Sacromeres are made up of filaments; filament structure Picture 4 1. Actin filament a. 50 diameter b. 1 micrometer long c. Globular subunits d. Attached to z lines 2. Mysoin filaments a. 100 diameter b. 1.5 micrometers long c. Bundles of parallel strands of protein d. Myosin cant change its length (myosin= A band) 3. During Maximal contract a. Actin filaments slide in, they dont stretch b. Dark area is where actin overlaps myosin c.c....
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- Spring '08