Muscular System Alex Wiemann. Muscular System Function Stabilize the body and produce movement.

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Presentation transcript:

Muscular System Alex Wiemann

Muscular System Function Stabilize the body and produce movement

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 Attaches to bones Has striations Contraction is controlled consciously.

Types of Muscle Tissues

Structure of Saromere

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

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

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

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