PHYSIOL 201 Chapter Notes - Chapter 4: Skeletal Muscle, Cardiac Muscle, Myofibril
30 Jan 2019
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Prework #4: skeletal muscle part 1 - pages 257-261. Involved in movement of the skeleton, maintenance of posture, production of heat. Muscle of the heart: contractions generate pressure that ejects blood from heart. Intermediate in size for muscle cells and drives blood flow through the circulatory system. Surrounds tubes and organs (blood vessel, airways, gi tract, bladder, uterus) Contractions can change diameter and/or generate pressure. Diameter change alters resistance to flow and so controls flow. Support and movement of the skeleton (skeletal muscle) Generation of pressure in hollow cavities (cardiac muscle and smooth muscle) Changes in the diameter of hollow tubes (smooth muscle) About half of the body"s mass is composed of skeletal muscle. Most muscles linked to bones by tendons. Skeletal muscles make up a system of mechanical levers that develop force via contraction. Whole muscle is attached to bone via tendons.
