Phystut8 - Muscles Alick to MacDonald Cndrew edit Master...

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Click to edit Master subtitle style 2/28/10 Muscles Andrew MacDonald December 3rd, 2009 phys2130uwo@gmail.com
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2/28/10 Muscle Muscles allow for motion and the production of heat. Skeletal muscles & bones allow our bodies to carry out locomotion. Skeletal muscles can also produce heat (shivering thermogenisis) when needed. Cardiac muscle is the main component of heart, Main focus in the section
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2/28/10 Structure of Skeletal Muscle Skeletal muscle is composed of bundles (fascicles) of multinucleated muscle cells (muscle fibers) Within a muscle fiber(cell) there are numerous myofibrils which in turn contain myofilaments. The two types of myofilaments are? The myofibril is made of up a series of sarcomeres , the basic contractile unit of a muscle. 1. Thick myofilaments (myosin) 2. Thin myofilaments (actin) Z-disk to Z-disk, sarcomeres are important in understanding the
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2/28/10 Structure of Skeletal Muscle (2) Multinucl eated
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2/28/10 Structure of Skeletal Muscle (3) These are equivalent figures, use whichever you prefer. The sarcoplasmic reticulum wraps around each myofibril and forms a sleeve- like structure. The lateral sacs or terminal cisternae stores calcium. Muscle cells have a lot of mitochondria, which produce ATP. ATP provides the primary source of energy for muscle
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2/28/10 Structure of Skeletal Muscle (4) T-tubules are important in excitation process of muscles. They are continuous with the plasma membrane of muscle cells (sarcolemma) They pass between lateral sacs or terminal cisternae of adjacent segments of the sarcoplasmic reticulum. Muscle cell membrane The lumen of the T- tubule is continuous with?? The Extracellular Fluid!
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2/28/10 Thin Myofilament (Actin) Thin filaments contain three components. Actin A globular protein which forms a two-stranded chain and contains myosin binding sites (black) Tropomyosin A rod shaped protein composed of two protein Tropom yosin Troponi n
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2/28/10 Thick Filament (Myosin) The thick filament is comprised of myosin only. Each individual myosin
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This note was uploaded on 02/27/2010 for the course PHYSIOL 2210 taught by Professor Betts during the Spring '10 term at UWO.

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Phystut8 - Muscles Alick to MacDonald Cndrew edit Master...

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