PHYSIOL 335 Chapter 9: Physiology 335 Lab 5 Reading Notes
5 Oct 2016
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Lab 5: skeletal muscle electromyography reading notes (pgs. Muscle fiber is made by fusing many undifferentiated, mononucleated cells known as myoblasts. Satellite cells: undifferentiated cells found within skeletal muscle tissue that can fuse and develop into new muscle fiber following muscle injury. Hypertrophy: increase in size: ex: muscle fibers increase in size with heavy exercise. Muscle: many skeletal muscle fibers bound together by connective tissue. Contains glycogen and myoglobin (carries oxygen: myofibrils (cylinder) Stores calcium (especially by the edge near the t-tubule) Terminal cisterns (swellings the ca2+ makes in the sr) Triad (terminal cistern-t tubule-terminal cistern: sarcomeres. Functional unit of a skeletal muscle cell. Z disc (made of structural proteins that hold the thin filaments in place and separate one sarcomere from the next) I band (where you only see thin filaments) A band (length of the thick filaments) H zone (where you only see thick filaments) M line (hold thick filaments in place made of structural proteins)
