Anatomy and Cell Biology 2221 Lecture Notes - Lecture 3: Orbicularis Oris Muscle, Glycolysis, Agonist
27 Feb 2017
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Muscular tissue accounts for 40-50% of total body mass. There are three types of muscular tissue: skeletal move the skeleton, cardiac pumps our heart, smooth diameters of tubes. Stabilizing body positions: standing and holding. Storing and moving substances: glycogen, blood. Producing heat: shivering and activating metabolism. Muscle fibres: do not multiple but can grow in size and volume. Satellite cell: myoblast attached to immature muscle fibre. A skeletal muscle bundle consists of a body (belly) connected by tendons to the skeleton: contain fascicles. Thick (myosin) and thin (actin) filaments that form sarcomeres. Myosin head draws actin closer to m line (center)= muscular contraction. Wrapped in electrically conductive layer called sarcolemma. Bind muscle fibres together and hold them in parallel alignment so they can work together to produce force. Provide muscle with most of its natural elasticity and carry blood vessels and. Indirect attachments: cordlike tendon or flat sheet, more common attachment. Myofibrils are built from three kinds of proteins:
