BIOL 1141 Chapter Notes - Chapter 39.3: Endoplasmic Reticulum, Phosphocreatine, Myocyte

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Muscles make up 40% of the weight of an average human and is 15% more dense than fat tissue. Tendons: strap of fibrous connective tissue that connects skeletal muscle to bone: muscles can only pull, they cannot push, because of this they must work in antagonistic pairs. Tetany: severe spasm caused by involuntary contraction of the skeletal muscles due to a calcium imbalance. Sarcolemma: plasma membrane of a muscle fiber, also forms the tubules of the t system involved in muscular contraction. Sarcoplasmic reticulum: smooth endoplasmic reticulum of skeletal muscle cells, surrounds the myofibrils and stores calcium ions. Myofibril: specific muscle cell organelle containing a linear arrangement of sarcomeres, which shorten to produce muscle contraction: cylindrical and run the length of the muscle fiber, has light and dark bands. Sarcomere: one of many units, arranged linearly within a myofibril, whose contraction produces muscle contraction.

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