Ch.11 & 12, pt.1 Muscles

Ch.11 & 12, pt.1 Muscles - P215 Fall 2009 MOTOR...

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P215 Fall 2009 MOTOR SYSTEMS and MUSCLE, Part 1 Stanfield and Germann: Chapter 11, pages 314-318; Chapter 12, pages 323-331 MOTOR SYSTEMS and MUSCLE Motor Systems 1. muscle and nervous system working together 2. initiate, coordinate and carry out motor activity 3. two major motor systems Muscles 1. three types 2. specialized to do one thing very well 3. involved in motor activities vital for life 4. largest tissue mass in body Focus on somatic motor system SKELETAL MUSCLE Skeletal Muscle Structure myofibrils sarcomeres bundles ("fascicles") of muscle cells muscle cells ("muscle fibers") - large, long cells multiple nuclei striped (“striated”) filaments thick filaments thin filaments skeletal muscle skeletal muscle bundles of muscle cells in a muscle muscle cell ("muscle fiber") in a bundle myofibrils in muscle cell sarcomeres in a myofibril filaments in a sarcomere size number small large one many from figure 12.1
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sarcomeres and filaments (figures 12.4 and 12.5) proteins proteins
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thin and thick filaments OVERLAP at some places in sarcomeres overlap of thin filaments with heads and tails of thick filaments why OVERLAP of thin and thick filaments in sarcomeres matters - from figure 12.2 sarcoplasmic reticulum (SR) - transverse tubules ("T tubules") - sarcolemma - ________ ________ (”plasmalemma”) of skeletal muscle cell Fox, McGraw-Hill, ninth edition
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PROCESS OF CONTRACTION IN SKELETAL MUSCLE three stages 1) 2) 3) stage 1 - EXCITATION of muscle cells nervous system excites skeletal muscle cells via chemical synapses - somatic motor neurons skeletal muscle cells Skeletal muscle cells depend on the nervous system to tell them i) ii) iii) The motor neurons that send command signals to skeletal muscle cells are called ________ motor neurons. Axons of SMNs carry signals to skeletal muscle cells.
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Ch.11 & 12, pt.1 Muscles - P215 Fall 2009 MOTOR...

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