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Muscular System

Muscular System. Alex Wiemann. Muscular System Function. Stabilize the body and produce movement. Types of Muscle Tissues. Cardia c : Located in heart Has striations of alternating light and dark bands . Contraction is subconscious . Smoot h:

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Muscular System

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  1. Muscular System Alex Wiemann

  2. Muscular System Function • Stabilize the body and produce movement

  3. Types of Muscle Tissues • Cardiac: • Located in heart • Has striations of alternating light and dark bands. • Contraction is subconscious. • Smooth: • Located in blood vessels, stomach, intestines, and bladder • Not striated • Contraction is subconscious. • Skeletal • Attachesto bones • Has striations • Contraction is controlled consciously.

  4. Types of Muscle Tissues

  5. Structure of Saromere

  6. Sliding Filament Model • Nervous impulse arrives at NMJ • Ach is released and causes depolarization • Ca++ is released from sarcoplasmic reticulum • Ca++ binds to Troponin allowing myosin filaments to attach to actin, forming a cross-bridge • ATP breaks down and releases energy which enables myosin to pull actin filaments inward to shorten the muscle

  7. Duchenne Muscular Dystrophy • Definition: X-linked genetic disorder caused by a defective gene for dystrophin – a muscle protein • Signs and symptoms: fatigue, muscle weakness which begins in legs and pelvis, frequent falls, difficulty walking-especially by age 12 • Prevalence: 1 out of 3600 male infants • Treatment: no cure, treatment aims to control symptoms to maximize quality of life, encourage activity to strengthen muscles

  8. Myasthenia Gravis • Definition: neuromuscular/autoimmune disorder where the immune system produces antibodies that block the muscle cells from receiving messages from nerves • Signs and symptoms: Breathing difficulty, difficulty climbing stairs/talking/maintaining steady gaze, fatigue, double vision, eyelid drooping • Prevalence: 14-20/100,000 • Treatment: no known cure, medications to improve nerve communication and/or suppress the immune system

  9. Resources • http://shs.westport.k12.ct.us/mjvl/anatomy/MandalaWeb/muscular.htm • http://www.brianmac.co.uk/muscle.htmhttp://163.16.28.248/bio/activelearner/38/ch38c1.html • http://www.teachpe.com/anatomy/sliding_filament.php • http://www.ehow.com/facts_5525134_diseases-disorders-muscular-system.html • http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001724/ • http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001731/

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