Bone tissue and Microscopic Structure Flashcards
Bone has cells…
as well as a calcified extra-cellular matrix
How do bones change depending on how we use our body?
Bone cells respond to external forces and remodels and can change shape through your life to reflect how you are using your skeleton.
When a bone is broken..
Bone tissue will form and reform to connect those bits of bone that are broken from one another.
Why do bone cells respond to trauma
To unite broken parts
What are majority of bones made out of
They are made out of a matrix not cells
What is the inorganic portion of the extracellular component of the bone
The inorganic portion is made out of mineral which makes the bone hard and unique among other tissues
What is the organic portion of the extracellular component of the bone
What are the two extracellular components of the bone
Organic and inorganic
What is the function of the connective tissue of the bone
It supports other tissues or organs and helps it maintain its form
What percentage of the extracellular component of the bone is organic
33%
What allows bones to have flexibility?
Collagen fibres which criss cross across the organic matrix
If the bone did not have some level of flexibility,
putting pressure on it will break it
When the collage from a bone is removed,
it breaks easily and is very brittle
Why is the organic component of bones important
To have flexibility and take the weight
What percentage of the bone’s extracellular component is inorganic
67%
What is the purpose of the mineral components in a bone?
It makes the bone hard and resistant to compression
What happens when the bone’s inorganic components are removed?
The bone will be too flexible because of the lack of the inorganic components replaced with only the collagen.
What are the minerals that make a bone inorganic?
Hydroxyapatite and other Calcium minerals or mineral salts
What percentage does the cellular component of the bone make up by weight?
2%
What are the mature bone cells
Osteocytes
What are the four types of cells
- Osteogenic cells
-Osteoblasts
-Osteocytes
-Osteoclasts
The same amount of bone must be maintained/balanced during childhood
True
2/3 of the matrix is…
inorganic
What do osteoblasts do?
These bone cells work in teams to produce new bone called osteoid. They control calcium and mineral deposition, secreting out the matrix of bone.
1/3 of the matrix is ..
organic
What do osteocytes do?
Osteocytes are what osteoblasts turn into when they have stopped making bone. They stay within the bone matrix and they maintain the bone by recycling proteins and minerals from our matrix and communicate with other cells whether more bone should be formed or destroyed.