ANAT 101 Lecture Notes - Neuromuscular Junction, Sarcomere, Axon Terminal
1 Feb 2014
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Document Summary
3 types of muscle tissue: skeletal muscle tissue. Long, cylindrical, striated, multinucleate (nuclei are pushed to the side) Short, branched, striated, usually single nucleus (nuclei in centre) 5 functions of skeletal muscles: produce movement of skeleton. Pull on tendons that move bones: maintain posture and body position, support soft tissues, guard entrances and exits. In the form of sphincters: maintain body temperature. With muscles of abdominal wall and pelvic floor. When contraction occurs, energy is used and converted to hear. Single skeletal muscle cells (aka skeletal muscle fibers) The sarcolemma and transverse tubules sarcolemma: muscle fibre plasma membrane. Has openings across surface that lead into network of transverse tubules (t tubules) T tubules: allow for electrical stimuli to reach deep into each fiber sarcoplasm: muscle fiber cytoplasm. Myofibrils in muscle fiber: hundreds to thousands in each fiber, encircled by t tubules and are as long as the entire muscle fiber, bundles of thick and thin myofilaments.
