the muscular system - pnhs.psd202.org
TRANSCRIPT
All movements
Pump blood throughout body
Move food through digestive system
Control movement of air in and out of your lungs
Contraction = the shortening of a muscle
Extension = the stretching of a muscle
Example – bicep/tricep
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
SMOOTH SKELETAL CARDIAC
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
MUSCULAR DYSTROPHY
Inherited disorder Progressive wasting away of skeletal
muscles No cure, but weakening can be delayed
with exercise
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
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