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18 Cards in this Set
- Front
- Back
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general functions of the muscular system
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movement of the body as a whole, heat production, posture
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3 phases of twitch contractions
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latent, contraction, relaxation
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latent phase:
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nerve impulse travels to the SR to trigger release of CA++
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contraction phase
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Ca++ binds to troponin and sliding of filaments occurs
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relaxation phase
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sliding of filaments cease
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cardiac muscle found only in
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heart
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sprain
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injury occurs in the area of a joint and a ligament is damaged
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myositosis
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any muscle inflammation, including that caused by a muscle strain
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strain myalgia
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involve overstretching or tearing of muscle fibers
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fibromyositis
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tendon inflammation occuring with myositis (charlie horse)
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painful muscle spasms, involuntary twitches
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cramps
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involve local internal bleeding and inflammation
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contusion
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damage affected muscle tissue
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crush injury
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crush injury can be life threatening if muscle fiber contents enters ___
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bloodstream
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myasthenia gravis
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chronic disease characterized by muscle weakness, especially in the face and throat. immune system attacks muscle cells at the neuromuscular junction
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hernias
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weakness of abdominal muscles can lead to the protrusion of an abdominal organ through an opening in the abdominal wall
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types of hernias
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inguinal hernia, femoral hernia, strangulated
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6 steps of cross bridge cycling
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1. influx of calcium, triggering exposure of binding sites on actin. 2. binding of myosin to actin. 3. power stroke of the cross bridge that causes the sliding of the thin filaments. 4. binding of ATP to cross bridge results in the cross bridge disconnecting from actin. 5. The hydrolosis of ATP, leads to re-energizing and repositioning of the cross bridge. 6. transport of CA++ back into the SR.
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