skeletal and muscular system
skeleton
protect organs
help body move
to support body
to make blood cells
calcium to keep bones strong
bone is tissue with blood supply
made of 200 bones
support
sketeton supports body
protection
ribs protect heart
backbone protects spinal cord
skull protects brain
movement
some bones in skeleton are joind rigidly
others are joined with each other by flexiable joints
joints
bones are linked toghether by joints
synovial joint
covered in cartilage
if two bones moves against each other the would eventually wear away
hinge joints
ball and socket
muscles
work by getting shorter
contract and relax
attached to bones by tendons