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?