Seminar 2 Objectives - Seminar 2 The Muscular System(CH 10...

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Seminar 2: The Muscular System (CH. 10) 1. Specify the functions of skeletal muscle tissue. (pg. 280) Produce skeletal movement Maintain posture and body position Support soft tissues (ex- floor of pelvic cavity) Guard entrances and exits (ex- the upper part of esophagus, external anal sphincter, and external urethral sphincter. Produce heat to maintain body temperature Store nutrient (protein) reserves 2. Describe the organization of muscle at the tissue level. Muscle cells or fibers Connective tissues 1. Epimysium: dense layer of collagen fibers around entire muscle 2. Perimysium 3. Endomysium: delicate tissue Nerves Blood vessels 3. Describe the characteristics of skeletal muscle fibers, and identify the structural components of a sarcomere. (pg. 283-287) Very long cells developed by fusion of mesodermal cells (myoblasts) Sarcolemma: Cell membrane of a muscular fiber that surrounds sarcoplasm. Changes in transmembrane potential begin contractions Transverse (T) tubules: Deep invaginations of the sarcolemma, which carry electrical impulses deep into cells. Allow entire muscle fiber to contract simultaneously. Same properties as sarcolemma. Sarcoplasm: cytoplasm of muscle cells Sarcoplasmic Reticulum: Membranous network of tubules that surrounds each myofibril. Helps transmit action potential to myofibril. Similar in structure to smooth ER. Forms chambers (terminal cisternae) attached to T tubules Triad: Formed by one T tubule and two terminal cisternae (chambers) Myofibrils: Long, parallel, cylindrical structures surrounded/separated by SR. Containe myofilaments (thin=actin; thick= myosin) Sarcomere: Repeating units of thin & thick filaments along myofibril and muscle fiber. Causes skeletal muscle tissue to have striated appearance under microscope. Smallest functional unit of the muscle fiber o Alternating dark A bands in center of sarcomere—don’t shrink when muscle contracts M line: proteins that centrally stabilize the thick filaments
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