Medical Sciences 3999A/B/Y Lecture Notes - Lecture 21: Skeletal Muscle, Soleus Muscle, Intermediate Filament
16 Feb 2020
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*additional properties of skeletal muscles: extensibility and elasticity. Myocyte: contractile unit; muscle cell or muscle fibre. Sarcoplasmic reticulum (sr): smooth endoplasmic reticulum of muscle fibres, that functions to reuptake and store ca2+ Heat production during contraction needs to be dispersed. Metabolic products of contraction need to be removed. Ct to cover nerves and blood vessels entering and leaving muscle fibres. Also required to provide a harness to enclose all muscle fibres into one unit --> this way, they can all contract together for voluntary movement. *composite tissue: muscular and nervous tissue, and epithelial glands occur along with ct components. Striated muscle: cross-striations, at right angles to long axis. These classifications are combined: 1) striated voluntary skeletal muscle, 2) striated involuntary cardiac muscle, 3) smooth involuntary muscle. An artery is accompanied by 2 veins together with a nerve. Branch out --> capillary network around each fibre. Individual capillaries extend from network and enter endomysium.
