Physiology 1020 Lecture Notes - Lecture 5: Endoplasmic Reticulum, Troponin C, Troponin T
Document Summary
Muscles utilize the chemical energy from the breakdown of food. 3 kinds of muscle; skeletal, cardiovascular and smooth. Smooth: within the walls of blood vessles/airways/ducts/bladder/uterus/digestive tract. Muscles 3 principle functions: (1) movement; (2) heat production (3) body support and posture. A whole look at the structure of a muscle. Whole muscles are made up of bundles of fasciculi. Each fascicle is made up of groups of muscle cells or fibers. Each muscle cell/fiber is made up of many myofibrils. Each myofibril contains thick and thin myofilaments. Thin filaments actin, protein/ troponin and tropomyosin. Whole muscle fasiculi (surrounded by perimysium) . Muscle cell/fiber (surrounded by sarcolemma) myofibrils (surrounded by sarcoplasmic reticulum) at the end of a myofibril is a terminal cisternae . Muscle cells/fibers are one of the few cells with more than one nucleous. Muscle cells/fibers are surrounded by sarcolemma (muscle membrane) over which the action potential is transmitted.