08-Musclenotes-1 - Muscles Muscle structure Muscle cell =...

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Unformatted text preview: Muscles Muscle structure Muscle cell = muscle fiber o Elongated cell, multiple nuclei (because it is so long) o Contains numerous bundled myofibrils o Myofibrils is comprised of thick and thin myofilaments It is primarily actin and myosin It can also be troponin and tropomyosin o Muscle fascicle: fibers bundled together o Muscle: fascicles bundled together Muscle structure figure Structure of myofibrils Myofibril movement produces muscle contraction Troponin/tropomyosin control contraction The arrangement of proteins critical to function Myofibril proteins are organized into structures called sarcomeres which are a functional unit of muscle Sarcomeres Sarcomeres are basic subunit of muscle contraction A bands = stacked thick and thin myofilaments H bands = center of the A bond, which consists of thick bands only (composed of myosin) Actin myosin Horizontal I bands = consist only of thin myofilaments o I bands are light bonds made of actin o They are divided into 2 halves by a disc of protein called a z...
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This note was uploaded on 04/11/2011 for the course BIO 111 taught by Professor Dr. bos during the Winter '10 term at Purdue University-West Lafayette.

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08-Musclenotes-1 - Muscles Muscle structure Muscle cell =...

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