The Muscular System - pnhs.psd202.org
Transcript of The Muscular System - pnhs.psd202.org
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All movements
Pump blood throughout body
Move food through digestive system
Control movement of air in and out of your lungs
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Contraction = the shortening of a muscle
Extension = the stretching of a muscle
Example – bicep/tricep
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SMOOTH MUSCLE
Type of muscle concerned with movements of internal organs
Intestines, bronchi of lungs, the bladder,
Involuntary – work without control
SKELETAL MUSCLE
Striped, or striated, muscles attached to bones that cause body movements
Form the largest part of the body’s M.S. ( > 600)
Voluntary - under conscious control
CARDIAC MUSCLE
Special type of striated tissue that forms the walls of the heart
Heart is most important muscle in body
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SMOOTH SKELETAL CARDIAC
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More use = more efficient/strong Exercise strengthens the heart (more blood
pumped in a 1 beat) Practice good posture Increase muscle tone Eat nutritious foods
“Use it or lose it” – an unused muscle will atrophy, or waste away
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MUSCULAR DYSTROPHY
Inherited disorder Progressive wasting away of skeletal
muscles No cure, but weakening can be delayed
with exercise
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MUSCLE STRAIN
aka “pulled muscle” = tearing or stretching of muscle fibers
Usually occur in large muscles
Treatment = ice, wrap, rest
BRUISE
Discolored area under the skin caused by leakage of blood after an injury
Treatment = ice can reduce pain/swelling
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TENDINITIS
Inflammation of a tendon
usually caused by overuse
Symptoms = pain, tenderness, restricted movement
Treatment = anti-inflam. meds
HERNIA
Protrusion of an organ or tissue through a weak area in the muscle
Abdominal – protrudes through weak area in abd. wall
▪ may appear after lifting heavy objects
Surgery