KNES 210 Lecture Notes - Lecture 3: Tibialis Posterior Muscle, Gluteus Medius Muscle, Motor Unit
8 Oct 2016
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Composition: 72% water, 20% proteins, 8% minerals, glycogen, and triglyceride. Types: cardiac: unique because of auto-rhythmicity. Without any external stimulus from the neuro or endocrine systems it depolarizes and contracts. Rhythm is created by sa node, generates normal sinus rhythm: smooth: intestines, arteries, glands. Myofibril muscle fiber fasciculus perimesium endomesium epimesium. Arrangement of contractile filaments (actin and myosin) in a sarcomere. The functional unit of the myofibril is a sarcomere. Runs from z line to z line: run entire length of myofilament, composed of thick filaments (myosin) and thin (actin) When stimulated, the myosin heads will bind to the active site on the actin with the release of atp, causes a power stroke and the thick filaments to be rowed over the thin filaments. If you look at a muscle under a microscope, it will have a striated appearance. Bands of lighter and darker correspond to the overlapping of the actin and myosin.
