Physiology 2130 Lecture Notes - Lecture 1: Connective Tissue, Vascular Resistance, Carotid Sinus
23 Aug 2016
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Describe the structural components of skeletal muscle a whole muscle like the biceps muscles, is made up of bundles of fascicles each fascicle contains bundles of muscle cells (also called fibres) Dark band = a band (thick with thin in-between) light band = i band (thin connecting to thin) Describe the structural components of the skeletal muscle cell (fibre) Muscle cells also contain many mitochondria which produce atp. Where ca2+ is released to trigger muscle contraction. Ca2+ inhibits troponin, which releases tropomyosin from the myosin binding sites. Myosin itself is made up of 2 long polypeptide chains each of which has an alpha-helical. Tails lie along the axis of the thick filament and the heads extend out to the sides: myosin heads of myosin molecules at either end of the filament point in opposite directions. Each head has a binding site for actin and an atpase which breaks down atp to adp and.
