BIOL 141 Lecture Notes - Lecture 7: Endoplasmic Reticulum, Neuromuscular Junction, Myocyte

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20 Jan 2017
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Smooth muscle: has narrow cylindrical fibers, non-striated and uninucleated, occurs in walls of internal organs, involuntary. Cardiac muscle: has striated, branched, generally uninucleated fibers, occurs in walls of heart, involuntary. Skeletal muscle: has striated, branched, generally multinucleated fibers, usually attached to bone, voluntary. Tendon: projects beyond ends of muscle and attaches to bone. Aponeuroses: broad, fibrous sheets to bone or adjacent muscle. Perimysium: extends inward and separates fascicles: bundles of fibers. Fiber: single muscle cell, multiple nuclei, thin, elongated, cylinder. Sarcomere: repeating pattern formed from organization of thick and thin filaments (striations) z line to z line. A band- dark thick myosin overlapping thin actin. Thick filaments- many molecules of myosin, head project outward. Thin filaments- double actin twisted, myosin heads bind. Sarcoplasmic reticulum- network of membranous channels surrounding each myofibril, full of calcium. Neuromuscular junction: motor neuron axon and skeletal fiber meet. Neurotransmitters: chemicals released by neurons to communicate (cross through synapse)

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