[KINE 2011] - Midterm Exam Guide - Everything you need to know! (27 pages long)

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 2011
• Professor: Olivier Birot

Document Summary

Muscles = largest group of tissue in body. Skeletal mass makes up 40% of the total 50% (about 32% for women) Smooth and cardiac muscles make up the remaining 10% Muscle contraction = developing tension & shortening; involves movement of intracellular components. Controlled contraction allows: partial and whole body purposeful movement, manipulation of external objects, movement of content through hollow internal organs, emptying content of organs out to external environment. Striated muscle consists of: skeletal muscle, cardiac muscle. Non-striated muscle consists of: smooth muscle. Non-voluntary muscles (autonomic ns: cardiac, smooth. A myofiber is a single muscle cell. 10-100 micrometer in diameter, . 76m in legnth. If under a microscope; you can see alternating light and dark bands perpendicular to the long axis of the cell. Myofiber is formed by the fusion of undifferentiated cells & mononucleated cells; called myoblasts. Myoblasts are active during embryonic development, where it results in different nuclei in a single muscle cell due to the myoblasts.