KINE 1P90 Lecture Notes - Lecture 3: Endoplasmic Reticulum, Intercalated Disc, Skeletal Muscle

• School: Brock University
• Department: Physical Education and Kinesiology
• Course: KINE 1P90
• Professor: Panagiota Klentrou

Document Summary

Muscles are responsible for all types of body movement. Three basic muscle types are found in the body. Skeletal and smooth muscle cells are elongated (muscle cell = muscle fiber) Contraction of muscles is due to the movement of microfilaments. Cells are surrounded and bundled by connective tissue. Perimysium wraps around a fascicle (bundle) of muscle fibers. Often cross a joint due to toughness and small size. Attach muscles indirectly to bones, cartilages, or connective tissue coverings. Found mainly in the walls of hollow organs. Joined to another muscle cell at an intercalated disc. Contains the entire length of the thick filaments. Myosin filaments have heads (extensions, or cross bridges) At rest, there is a bare zone that lacks actin filaments called the. Excitability (also called responsiveness or irritability) ability to receive and respond to a stimulus. Contractility ability to shorten when an adequate stimulus is. Elasticity ability to recoil and resume resting length after.