BIOL-106 Lecture Notes - Lecture 2: Phosphocreatine, Lipolysis, Autonomic Nervous System

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10 Feb 2015
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Muscles are organized into three basic types: striated: skeletal muscle facilitates movement by applying forces to bones and joints through its contraction. Muscles have an origin; a thick portion of the muscle between the insertion and origin is called the muscle belly or gaster and a tendon: cardiac: cardiac muscle is an involuntary striated muscle found exclusively in the heart. Smooth muscle can be directly stimulated by the cns or can react to hormones secreted locally, such as vasodilators and vasoconstrictors. Anatomy: skeletal muscle fibers are made up of many myofibrils surrounded by sarcoplasmic reticulum. The sarcolemma is on the outside of the muscle fiber and contains many nuclei. Sarcomere: the dark striations of skeletal muscle are made up of a lattice of thick and thin filaments, which are formed into a functional unit of contraction known as the sarcomere. Sarcomeres are the basic unit of muscle, made up of actin and myosin.

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