HHP 3500 Lecture Notes - Lecture 15: Skeletal Muscle, Autonomic Nervous System, Myofibril

• School: University of Iowa
• Department: Health and Human Physiology
• Course: HHP 3500
• Professor: Peterson Clayton

Document Summary

Skeletal muscle structure: structure: whole muscle (bicep) compartments of cross- section bundles of muscle fascicles each bundle is made of muscle fibers/muscle cell, within the muscle, the muscles are surrounded by connective tissues. The connective tissue layers merge to form tendons, which connects muscle to the skeleton. Contraction stresses tendons, which pulls on bones, which causes body movement: parts: Characteristics of muscle fiber cells: sarcolemma-the cell membrane surrounding skeletal muscle fibers; provides compartmentalization. Has flux across membrane-ions, glucose, lipids, amino acids move across membrane. Specific to muscle fibers (differ from regular cells): it is excitable membrane (aka can depolarize and repolarization)- similar to neurons. Structures of t-tubules that blend around the different myofibrils (touching surface of sarcolemma), that ions rush through, and allow sarcolemma to depolarize. Muscle cells can store glucose as glycogen. Muscle cells have very high water concentration. Er; stores intracellular calcium! this sarcoplasmic retiuculum surrounds each myofibril. At rest, the protein called tropomyosin covers the binding site.