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The Muscular System

The Muscular System. Organs of the muscular system  muscles a group of specialized cells: function  contraction (shorten & thicken when stimulated  contract) 40-50% body mass = muscle >500 muscles involved in movement/contraction

susanna-rufus
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The Muscular System

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  1. The Muscular System Organs of the muscular system  muscles a group of specialized cells: function  contraction (shorten & thicken when stimulated  contract) 40-50% body mass = muscle >500 muscles involved in movement/contraction Ex. blink, smile, walk, digest, heartbeat

  2. Found everywhere in the body: beneath skin, surrounding internal organs and vessels, heart, attached to bones

  3. Smooth Muscle of Arteries and Veins

  4. Skeletal Muscle = • Muscle fibers bundled plus • Connective tissues plus • Blood vessels plus • Nerves • (Ex biceps arm muscles)

  5. Gracilis (anterior/medial

  6. Microscopic Structure of Skeletal Muscle Muscle Tissue: made of special contractile cells muscle fibers Each fiber filled with: Thick Myofilaments protein Myosin Thin Myofilaments  protein Actin Sarcomere: basic structure & functional contractile unit of skeletal muscle (runs Z line to Z line)

  7. During Contraction: Energy from ATP enables (thin) Actin and (thick) Myosin myofilaments to slide toward each other and shorten sarcomere, eventually, entire muscle  Sliding Filament Theory So, you ask, how does it happen?????

  8. The Last Contraction  Rigor Mortis (cold & stiff or rigidity of death) After death, cells don’t make ATP (no CR going on) No breathing, No O2, heart stops pumping, NS stops, metabolic rxs stop No ATP flooding myofibrils SO.. No new contractions and “last” contraction not released b/c no ATP to dissolve cross-bridges No heat produced from muscles & no blood flow  corpse “cold & stiff” (about 36 hours)

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