Movement in humans
brought about by the musculoskeletal system
Skeleton
- 20% of body weight
Components of our skeleton
Bones Cartilage
tissue formed by living cells tissue formed by living cells
- contains minerals: mainly - contains fewer minerals: softer,
Ca3(PO4)2 > makes bones rigid more elastic than bones
- contains proteins (collagen) and - @end surfaces of bones: absorb
water shock, reduces friction between 2
- contains blood vessels: supplies bones when they move against each
O2+nutrients, removes wastes other, prevent bones from wearing
- innervated by nerves away
- gives shape + support to some
Compact bone structures (pinnacle, nose, trachea)
- outer shell of bones - X bone marrow, blood vessels,
- shafts of limb bones nerves
- filled w yellow bone marrow
> stores lipids
- dense + hard: provides great
strength for supporting the body’s
weight
Spongy bone
- heads of limb bones
- porous: provides strength w
minimum of additional weight
- cavity filled w red bone
marrow > produces red
blood cells
Organisation of human skeleton
Axial skeleton Appendicular skeleton
lies on central axis of body lies on both sides of body
1) Skull 1) Limb bones
- cranium: 8 bones fused tgt - Arms + legs
@sutures (unmovable joints) > - Allow body movement
protects brain + some sense 2) Girdles
organs (eyes, ears) - Flat bones
brought about by the musculoskeletal system
Skeleton
- 20% of body weight
Components of our skeleton
Bones Cartilage
tissue formed by living cells tissue formed by living cells
- contains minerals: mainly - contains fewer minerals: softer,
Ca3(PO4)2 > makes bones rigid more elastic than bones
- contains proteins (collagen) and - @end surfaces of bones: absorb
water shock, reduces friction between 2
- contains blood vessels: supplies bones when they move against each
O2+nutrients, removes wastes other, prevent bones from wearing
- innervated by nerves away
- gives shape + support to some
Compact bone structures (pinnacle, nose, trachea)
- outer shell of bones - X bone marrow, blood vessels,
- shafts of limb bones nerves
- filled w yellow bone marrow
> stores lipids
- dense + hard: provides great
strength for supporting the body’s
weight
Spongy bone
- heads of limb bones
- porous: provides strength w
minimum of additional weight
- cavity filled w red bone
marrow > produces red
blood cells
Organisation of human skeleton
Axial skeleton Appendicular skeleton
lies on central axis of body lies on both sides of body
1) Skull 1) Limb bones
- cranium: 8 bones fused tgt - Arms + legs
@sutures (unmovable joints) > - Allow body movement
protects brain + some sense 2) Girdles
organs (eyes, ears) - Flat bones
