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MUSCULAR SYSTEM POWER POINT I. Muscular System joints, heat,etc.. -Protection, movement, Muscle cells are elongated so called muscle _____ Contraction due to microfilaments Myo, mys, sarco refer to: ________________ 3 types of muscle 1. Skeletal-attach to bones by____, multinucleated. ___________ and ___________ 2. SmootH Muscle is _________, single nucleus, located in_______________,& no _______________ 3. CARDIAC MUSCLE Has __________, involves the ___________, vol or invol? II. Microscopic ANATOMY Sarcolema is the plasma membrane of a muscle fiber Sarcoplasmic reticulum-stores and releases Ca+ Connective Tissue Coverings: Endomysium surrounds each muscle fiber Epimysium surrounds entire skel muscle Perimysium surrounds a bundle of fibers (fascicle) Muscles composed of myofibrils that have light bands (actin) and dark bands (myosin) The sarcomere has thick ______ and thin _____ filaments Myosin has heads that allow it to attach to actin. These form cross bridges with actin during contraction.