BIO 102 Lecture Notes - Lecture 9: Endoplasmic Reticulum, Intercalated Disc, Cardiac Muscle

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19 Dec 2016
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Tendons: fibrous muscle that attaches muscle to bone. Grouped into bundles by further coverings of connective tissue. Myofibril: make up muscle fibers, are parallel cyndrilical structures. Sarcoplasmic reticulum: consists of flattened, membrane-enclosed compartments filled with fluid containing a high concentration of calcium ions. T tubules: formed by plasma membrane that surrounds each muscle fiber. Sacromere: repeating subunits that make up myofibrils, connected to one another by z lines. Has a precise arrangement of thick and thin filaments. Filaments are composed of actin (thin) and myosin (thick) directions. The pattern goes; thin, thick, thin (gives striated appearance. ) Myosin has heads that hinge at the shaft. Neuromuscular junctions: cell bodies of most motor neurons are in the spinal cord and their axons exit the cord in spinal nerves and contact muscle fibers at these specialized synapses. Motor unit: the union of a motor neuron and the muscle fibers that it stimulates.

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