Types
Skeletal voluntary
Cardiac involuntary
Smooth involuntary
Makeup of skeletal
Made up of muscle fibers Inside each fiver are myofibrils They have light and dark bands formed by myofilaments Actin and myosin See book and diagram
Skeletal muscle organization
Muscle Muscle bundles Muscle fibers Myofibrils Myofilaments Actin and myosin
Muscle attachment
Muscle attaches to tendon which attaches to bone
Muscles attach through end fibers of adjacent muscles
Muscle characteristics
Irritability. Able to receive stimulus
Contractibility. Ability to shorten and thicken
Extensibility. Able to stretch and extend
Elasticity. Ability to return to original form
Muscles
Involved in locomotor apparatus
Allow us to move