Bones Flashcards
Function of bones
Framework and shape to the body Support and structure for the organs Protections for organs Allow for movements via joints Store minerals, flats and fats Produces blood cells
Bone is connective tissue
Cells are located far away
Non-cellular matrix
Macroscopic structure
Bones are organs - have own blood supplies
Multiple kinds of bone - long etc
3 mains parts of the long bone include - epiphysis, diaphysis and periosteum
Epiphyses - singular
Ends of the bone covered by a thin layer of particular cartilage
Compact bone surrounding cancellous (spongy) bone
Cancellous bone has cavities containing red bone marrow - produce blood cells
Diaphysis
Main length of bone
Hollow tube of compact bone
Yellow bone marrow cavity
Cavity stores fat
Periosteum
Outer surface of bone covered
Fibrous
Not at joints has articular cartilage instead
Located only at the diaphysis
Bone functions
Cancellous (spongy) bone used for support
Non-cellular matrix- created by vitamins and minerals (compact bone and marrow)
Bone functions
Spongey bone / Microscopic
Irregular thin bony plates called trabeculae
Bone cells occupy spaces within them, there is arrangement
Blood vessels pass through the irregular spaces
Capable of repair and continue form blood cells and store nutrients
Osteons
Compact bone - comprised of osteons
Each osteons contains a central canal. Surrounded by lamellar (layered rings)
Lacunae are the spaces in between the rings, which contain osteocytes
Osteons
Canaliculi (help to transport blood into the blood vessels) run between the lamellae
The central canal contains the blood capillary to transport blood to and from the bone
The osteons runs down parallel with the bone
Osteocytes
The bone cells - the 3 kinds of bone cells
Osteocytes
Generic bone cells between lamellae
Osteoblasts
On the edge of osteons. Makes the bone
Osteoclasts
The edge of the osteons
Breaks the down matrix - breaks down units of bones
