PC1001 Lecture Notes - Lecture 14: Skeletal Muscle, Cardiac Muscle, Smooth Muscle Tissue
Document Summary
In order to contract, a skeletal muscle must: Linking the electrical signal to the contraction is excitation-contraction. What skeletal muscles (can) do: ion. ction coupling. The region of a myofibril between two successive z discs. Composed of myofilaments made up of contractile proteins. Myofilaments are two types - thick and thin. A muscle fibre is made up of millions of sarcomeres connected in series eries. Myofibrils are built of 3 kinds of protein. Regulatory proteins which contraction on and off troponin and tropom. Structural proteins which provide proper alignment, elasticity and exte myomesin, nebulun, alpha actinin and dystrophin. Tails - two interw pomyosin. extensibility - titin, the protein myosin. Z disc by titin. ail and two globular terwoven, heavy n act. Heads - two small chains - form cros. An important feature of the myosin head which is essential to muscle contraction s that it functions as an atpase enzyme.
