ATI TEAS MUSCLE SYSTEM.docx - MUSCLE SYSTEM STRUCTURE OF MUSCLES FUNCTION Movement in the body sustaining posture and body position There are three

ATI TEAS MUSCLE SYSTEM.docx - MUSCLE SYSTEM STRUCTURE OF...

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MUSCLE SYSTEM STRUCTURE OF MUSCLES FUNCTION Movement in the body sustaining posture and body position. There are three types of muscle tissues: skeletal, cardiac, and smooth. Excitability: Electric gradient Contraction: Shorten Elongate: Relax Skeletal Muscles Smooth Muscles Cardiac Muscles Voluntary muscles that work in pairs to move Composed of muscle fibers (cells) that are bound together in parallel bundles. Also known as striated muscle due to their stripped appearance. I nvoluntary muscles that are found in the walls of internal organs such as the stomach, intestines and blood vessels. Smooth muscle tissue (visceral tissue) is nonstriated. Also found in sphincters or valves that control various openings through the body Involuntary muscle that is found in the heart Muscles Fascicle Fiber Myofibril Sarcomere MYOSIN (thick) & ACTIN (thin) Note: Where two bones meet is called a joint, or articulation. Ligaments (dense fibrous connective tissue) hold bones together. Muscles also help to stabilize the joint. When muscles contract, they move a joint. A muscle must cross a joint in order to move bones. Tendons (dense fibrous connective tissue) attach muscles to bones. The bone that moves is called the insertion of the muscle; the bone that doesn’t move during the contraction is called the origin. Some muscles have more than one origin and/or insertion, and some (such as some thigh muscles) cross more than one joint. In these cases, the movement is more

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