BISC276 Chapter Notes - Chapter 12: T-Tubule, Endoplasmic Reticulum, Globular Protein
7 Mar 2018
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Document Summary
Usually attached to bones by tendons made of collagen. Origin of muscle- the end of the muscle that is attached closest to the trunk or to the more stationary bone. Insertion of the muscle- the more distal or mobile attachment. Muscle fiber anatomy: o o o o o o o. Myofibrils- main intracellular structures in striated muscles that are highly organized bundles of contractile and elastic proteins that carry out the work of contraction. Sarcoplasmic reticulum (sr)- a form of modified endoplasmic reticulum that wraps around each myofibril like a piece of lace. Terminal cisternae- longitudinal tubules with enlarged end regions that are adjacent to and closely associated with a branching network of transverse tubules (t-tubule) Transverse tubules (t-tubules)- allow action potentials to move rapidly from the cell surface into the interior of the fiber so that they reach the terminal cisternae nearly simultaneously. Myofibrils are muscle fiber that contractile structures o o.
