C15 - Bone Flashcards
What are the functions of the bone
structural support in the skeleton
movement because bones are attachment site for muscles
Mineral regulations
Storage
Trapping
Regulation of the calcium concentration in the blood
what are the two types of bone
spongy/ cancellous bone
Compact bone
Where is spongy bone found
at the ends of the long bones and in the vertebrae.
What is the role of Bone marrow within the network of spaces
to produce blood cells.
What % of the bone in the body is made of compact bone
75%
what provides blood to the bone
haversian canal
where can you find a compact bone
surrounding most bones and gives them their white shiny appearance.😀
what is the role of osteoblasts
continually build up the compact bone
what is the role of osteoclasts
continually break down the compact bone
Where are the osteoclasts found
they are found in a matric secreted by the osteoblasts which is
30% organic
70% inorganic
What is a haversian system
the structural and functional unit of compact bone/ the osteon
What does a haversian canal contain
Arteriole
Venule
Lymph
Nerve fibres
how is a haversian system built
built in concentric rings
what secrete the hydroxy apatite that makes the lamaella
osteoblasts
what are the channels that radiate out of the lacunae into the bone lamella
Canaliculi
What are the 2 ways that osteoblasts get their nutrients and remove waste
The matrix of the lamellae is slightly permeable so food and oxygen brought by the blood can diffuse through the bone to the cells
the fluid and the processes from the osteoblasts in the canaliculi exchange materials the canaliculi run through the bone matrix and those of neighbouring lacunae make contact in a 3d network
what are cartilage bones derived from
hyaline cartilage in the embryo, in a process called ossification.
how does the procesess of osificiation work
Cartilage cells flatten and calcium salts are deposited around them. osteoblasts secrete layers of bones
matrix around the cartilage
while osteoclasts break the cartilage down and the blood bessels invade
why is bone described as being dynamic
it is constantly being broken down by osteoclasts and built by osteoblasts.
