KINE 2011 Study Guide - Final Guide: Atp Hydrolysis, T-Tubule, Endoplasmic Reticulum

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 2011
• Professor: Ali Abdul Sater

Document Summary

Muscle contraction = muscle develops tension and shortens. Muscles are 50% of body mass, skeletal muscle 40% Striated muscle: arrangement of thick/thin filaments composed of contractile proteins: actin=thin, myosin=thick, myofibril (a single muscle cell) = in their cytoplasm, 80% of volume of cell. In a microscope, seen as alternating light bands perpendicular to the long axis: sarcomere: filaments arranged in repeating pattern along length of myofibril. Skeletal muscle: myofiber fused by fusion of undifferentiated and mononucleated cells (myoblasts: 1 cylindrical, large multinucleated cell. A band: thick filaments in center of sarcomere (wide, dark band) Z line: 2 sets of thin filaments, one at each end, anchored to a network of connecting proteins: 1 sarcomere between 2 z lines. I band: lighter band, between ends of the bands of a when thin filaments do not the thick ones. H zone: center of the band a where without any thin filament overlapping thick.