Skeletal & Muscular System

The Skeletal System

Function

Performs vital functions support, movement, protection, blood cell production, calcium storage and endocrine regulation.

Bones- support, protection, and movement

Ligaments- define range of motion, protect joints and bones, connect bone to bone.

Muscles- ability to contract and maintenance of proper posture

Tendons- soft tissue , and connects muscle to bone.

Nerves- communicate with brain through transmitters and conducts impulses

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Disorders

Osteoarthritis

-paralyzation of bones

-pain in spine, and bones

-70% of adults between 55 and 78 years of age

-therapy is best


Club foot

-when foot is pointed inward

-soreness and noticeable

-150,000-200,000

-no real treatment besides surgery maybe

The Muscular System

Function

It permits movement of the body, maintains posture, and circulates blood throughout the body.


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How skeletal muscle contracts

The muscle contracts by a crossbridge combining actin and myosin in the sarcomere. The calcium ions bond with proteins and change their shape and the myosin filaments will help as well.

Disorders

Myositis: inflammation in the muscles

muscle weakness and muscle pain

effects less then 200,00 people a year



Muscular Dystrophy: Cause progressive weakness and loss of muscle mass. In muscular dystrophy, abnormal genes (mutations) interfere with the production of proteins needed to form healthy muscle.

  • Frequent falls

  • Difficulty getting up from a lying or sitting position

  • Trouble running and jumping

  • Waddling gait

  • Walking on the toes

  • Large calf muscles

  • Muscle pain and stiffness

  • Learning disabilities

1.3 to 1.8 per 10,000

no cure, but therapy slows down the disease