KIN 121 Lecture Notes - Lecture 10: Endoplasmic Reticulum, Myofibril, Myocyte
16 Dec 2015
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Document Summary
Skeletal muscle provide the force for motion (torque) to occur . Muscles must convert chemical energy into mechanical work. Features of both smooth and skeletal muscle tissue. Connective tissue, comprised mainly of the protein collagen It is continuous with, and part of, the tendons that join muscle to bone. Sometimes the tendon is in the form f broad sheets called the fascia. Sarcomere: functional unit- made up of myofibrils. Sarcoplasmic recticulum: net like labyrinth of tubules inside fibre. T-tubules: (transverse tubules) connect sarcoplasmic reticulum with outer membrane (sarcolemma) A muscle fibre contains many myofibrils made up of the contractile proteins (myofilaments): actin: (thin filaments) forms the framework, and slides over , myosin: (also called contractile filaments). The myofilament or contractile protein actin slides across myosin contraction of the sarcomere unit and thus muscle contraction. The sarcomere is the functional unit of a muscle fiber. It is the section of a myofibril from the z-line to the z-line.
