The skeleton is form of The skeleton is form of bones that are made of a substance called cartilage organic, this substance called ossein, solidified with a marble-like substance containing phosphate and calcium and magnesium carbonates.
How many bones we have babys have 336 bones and adults 206 bones. Why? Because when we grow some bones weld
They protec ? Skeleton protecto our organs and sitems
Periosteum Periosteum it's a thin, dense membrane that contains nerves and blood vessels.
Compact bone Compact bone this part is smooth and very hard.
Cancellou and bone marrow Cancellou bone, which looks a bit like a sponge. Cancellous bone is not quite as hard as compact bone, but it is still very strong. bone marrow bone marrow is sort of like a thick jelly, and its job is to make blood cells.