PHS 3504 Chapter Notes - Chapter 10: Endoplasmic Reticulum, Neuromuscular Junction, Myosin Head
26 Sep 2017
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Skeletal: attached to the bone: cardiac: found in the heart. Provide skeletal movement: maintain posture and body position, guard entrances and exits, maintain body temperature. Epimysium and perimysium contain blood vessels and nerves. Tendons or aponeuroses attach muscles to bone or muscle. The individual muscle itself contains muscle fascicles, which are bundles of muscle cells/fibers: a single muscle cell/fiber contains myofibrils. T-tubules (transverse tubules) and myofibrils aid in contraction. Smallest unit of muscle contraction: thick filaments: myosin, thin filaments: actin. I band: light band that contains only thin filaments. Z line: mark the boundary between adjacent sarcomeres: a band: dark band that contains thick filaments with an overlap of thin filaments, m line: center of the sarcomere. Connects the thick filaments to each other: h zone: contains only thick filaments. Zone of overlap: each thin filament is surrounded by thick filaments: myofibril. Contain thin and thick filaments: organized regularly. Levels of functional organization in skeletal muscle fibers.
