Muscular System. I. Introduction. A. Over 600 muscles make up muscular system. B. 45% of total body weight of an adult. C.
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1 I. Introduction A. Over 600 muscles make up muscular system B. 45% of total body weight of an adult C. Properties 1. Excitability: ability to receive and respond to a stimulus a. Skeletal muscle responds quickly with forceful contraction and then relaxes b. Visceral muscle responds slowly c. Cardiac muscle is quicker than visceral and stronger, but longer duration
2 D. Functions 1. Movement: locomotion/manipulation, heartbeat, moving substance through hollow organs 2. Posture maintenance 3. Stabilization of joints 4. Generation of heat 5. Protection of some internal organs II. Types of Muscle A. Cardiac 1. Form walls of heart 2. Contract to circulate blood 3. Striated 4. Involuntary B. Visceral/Smooth 1. Found in the internal organs of the body (digestive, respiratory, blood vessels and eyes) 2. No striations = smooth 3. Involuntary C. Skeletal 1. 40% of body 2. Attach to and cover bony skeleton 3. Longest fibers of all muscle cells 4. Striated 5. Voluntary III. Methods of Attachment of Skeletal Muscle to Bone A. Tendon 1. Strong, tough connective tissue cord (example: Achilles tendon)
3 B. Fascia 1. Tough, Sheet-like membrane 2. Covers and protects tissue C. Origin and Insertion 1. When muscles attach to bones, one end become the origin and one becomes the insertion 2. ORIGIN: end that does not move; usually proximal to insertion 3. INSERTION: end that moves when muscle contracts IV. Gross and Microscopic Anatomy of Skeletal Muscle A. Connective Tissue Wrappings 1. Endomysium: fine sheath of connective tissue around each muscle fiber 2. Perimysium: collagenic sheath around several muscle fibers, bundles 3. Epimysium: dense fibrous connective tissue surrounds entire muscle B. Arrangement of Fascicles 1. The more fibers packed in, the more powerful the muscle 2. The more parallele muscle fibers are to the long axis of the muscle, the more they can shorten 3. Pennate (feather-like) central tendon with short fascicles attached obliquely 4. Convergent: Broad origin, fascicles converge toward single tendon 5. Circular: fascicles in concentric rings, surround body openings C. Muscle Fiber Types 1. Red slow twitch fibers a. Thing fiber b. Red color, large amounts of myoglobin c. Fat metabolism d. Fatigue resistant e. High endurance f. Not much power 2. White-Fast twitch fibers a. Anaerobic pathway
4 b. Fatigable c. Short term, rapid, intense movement 3. Muscles contain a mixture of muscle fiber types 4. Sprinting white fast twitch 60% 5. Marathon red slow twitch 80% 6. Posture red slow twitch 7. Weight lifters white fast twitch = red slow twitch V. Physiology of Skeletal Muscle Contraction A. Energy Sources 1. Energy for resynthesis comes from breakdown of carbohydrates 2. Results depend on amount of oxygen available a. Moderate activity = adequate amounts of oxygen b. Strenuous activity = not enough oxygen
5 B. Muscle Tone 1. Steady partial contraction present at all times 2. Keeps muscles firm and healthy 3. Stabilizes joints 4. Maintains posture 5. Loss of muscle tone 6. Muscle fatigue - muscle unable to contract 7. Spasm - sudden involuntary contraction of muscle 8. Clonic alternating spasm with relaxation 9. Tetanus smooth sustained contraction 10. Tetany results of low calcium; increases excitability of neurons; loss of sensation, muscles twitching, convulsions VI. Actions or Movements of Skeletal Muscles A. Goniometry- measurement of joint movement B. Adduction- moving a body part toward the midline C. Abduction- moving a body part away from the midline D. Flexion- decreasing the angle at a joint E. Extension- increasing the angle at a joing F. Hyperextension- increases the angle beyond the anatomical position G. Circumduction- the distal end of an extremity inscribes a circle while the shaft inscribes a cone H. Supination- turn the palm upward I. Pronation- turn the palm downward J. Plantar Flexion- move the sole of the foot downward as in standing on the toes K. Dorsiflexion- move the sole of the foot upward
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