Physiology 2130 Chapter Notes -Troponin T, Phosphate, Cardiac Muscle

• School: Western University
• Department: Physiology
• Course: Physiology 2130
• Professor: all

Document Summary

Module 5 online notes (sec 5. 1 to 5. 24) Muscles are biological machines that utilize chemical energy from the breakdown and metabolism of food to perform useful work. The body contains over 600 different muscles, these muscles perform three principal functions: movement, heat production and body support and. A whole look at the structure of muscle. A whole muscle, like the biceps muscle of the upper arm is composed of groups of fasciculi surrounded by a white connective tissue (perimysium) Each fascicle is made up of bundles of muscle cells or muscle fibers. Within each cell there are cylindrical bundles of myofibrils. Myofibrils are composed of two types of myfilaments which are the actual contractile elements of the cell. Muscle cells (or fibers) are one of the only cells in the body with more than one nucleus. They are surrounded by the sarcolemma the muscle cell membrane over which the action potential is transmitted.