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About Your
muscles
MUSCULAR SYSTEM TRIVIA
If you weigh 120 pounds, approximately how much of the weight is muscle?
Approximately 50 pounds
MUSCLE TISSUE- 3 Types
SKELETAL- attached to bone, voluntary, striated (because of stripes & striae)
CARDIAC- heart muscle SMOOTH- nonstriated, involuntary,
found in visceral(organs) and blood vessel walls
FUNCTION OF MUSCLES- to contract and lengthen
SKELETAL MUSCLE FUNCTION 1) MOVEMENT
2) POSTURE- MUSCLE TONE3) HEAT PRODUCTION
MOVEMENT
Muscles move bones by pulling on them, shortening and contracting.
The muscle that BENDS the joint is called the FLEXOR. The muscle that straightens the joint is called the EXTENSOR muscle.
MOVEMENTS
Flexion- movement that makes a joint angle smaller
Extension- movement that makes joint angle larger
More movements
Abduction- moving body part away from the midline; “abduct”
Adduction- moving body part toward the midline; “add”
ROTATION
Moving around longitudinal axis example: “shaking your head no”
Do you remember the muscles you labeled last week?