Musculoskeletal System

Slow twitch muscle fibers

- endurance cells
- react and use energy slowly so they can work for longer periods
ie. back muscles which contain slow twitch muscles to maintain your posture all day

Fast twitch muscle fibers

- react instantly when triggered but quickly use up there energy and tire up
ie. a sprinter will accumulate more fast twitch muscles in their legs through continuous practice enabling themself to quickly if briefly pick up the pace

Medial (internal rotation)

Turning your foot inward

Lateral (external rotation)

Turning your foot outward

Flexion

Bringing it in

Decreasing angle of the joint

Bending the joint smaller (smaller angle)

Extension

Brining it out

Increasing angle of the joint

Straightening the joint longer (larger angle)

3 main muscle types

Skeletal Muscle

- attached to your skeleton, voluntary

- stirated (walls of blood vessels and hollow organs) ie. spleen

- found in your heart, involuntary

- non-striated
ie. heart/myocardium

- found in internal organs, involuntary

Terms

Bones- create the rigid framework that everything else uses

Muscles: pull on bones, allowing us to move

Tendons: connect muscles to bones

Ligaments: connect bones to bones by holding joints together

Cartilage: found inside the joint and pads the ends of bones and cushions them

Abduction

Inside and moving away from your body

Moving the limb away from the center of the body

Adduction

Moving away from your body and coming close to your body

Moving the limb towards the center of the body

Supination

Pronation

Put your arms back into anatomical position, (pronating your wrist)

Functions of the Musculoskeletal System

Stability