TEST4 BIO NOTES

TEST4 BIO NOTES - November 1,2010 Muscle Tissue Functions 1...

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November 1,2010 Muscle Tissue Functions 1. Movement 2. Respiration 3. Posture Maintenance 4. Heat Production 5. Communication 6. Heart Beat ( Bold without these we are dead) Properties of Muscle Tissue 1. Contractibility - shorten forcefully 2. Excitability - responds to stimuli 3. Extensibility - can be stretched 4. Elasticity - recoils to resting length MUSCLE TYPES 1. Skeletal - Multinucleate - Striated (lines) - Voluntary - Packed Tightly 2. Cardiac - Involuntary - Loosely packed - Large disks that aid in communication for heart beat – intercalated discs
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3. Smooth - 1 nucleus - Tightly packed - No striations - Involuntary CONNECTIVE TISSUE OF MUSCLE An individual muscle cell is a sarcomere . Several sarcomeres form a muscle fiber . A muscle fiber is surrounded by a membrane endomysium . A group of muscle fibers forms a fasciculus or a bundle . Each fascicule is surrounded by a membrane perimysium . A bundle of fascicule form a muscle. A muscle is surrounded by a membrane epimysium or fascia . MUSCLE FIBER STRUCTURE - (microscopic) A single muscle fiber is composed of myofibrils . These small units (myofibrils) are composed of 2 types of proteins. These proteins have a general name- myofilaments . 2 proteins that compose the myofilaments: (1) actin forms a thin filament. (2) myosin forms a thick filament. The 2 proteins are organized to form a sarcomere. The sarcomere is bordered on either side by structures called Z-discs . Sarcomeres joined end to end form a myofibril. SLIDING- FILAMENT MECHANISM OF MUSCLE CONTRACTION
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This note was uploaded on 05/02/2011 for the course BIOL 102 taught by Professor Henry during the Spring '08 term at Baton Rouge CC.

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TEST4 BIO NOTES - November 1,2010 Muscle Tissue Functions 1...

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