Bone Flashcards
1
Q
4 functions of bones?
A
- Support
- Protection
- Metabolism stores
- Hematopoiesis
2
Q
What is endochronal ossification?
A
- Bone first forms as hyaline cartilage
- Blood vessels and osteogenic cells invade the cartilage
- Cartilage is slowly converted to bone, but remains at the epiphyseal plates.
3
Q
Where does endochronal ossification occur?
A
Any bones that aren’t in the head or clavicle.
4
Q
What is intermembranous ossification?
A
- The bone first forms as a fibrous plate
- Bone cells then differentiate from fibroblasts
- No cartilaginous phase
5
Q
What are the three main factors of the composition of bone?
A
- Water
- Protein
- Minerals
6
Q
What % of bone is water?
A
20%
7
Q
What % of bone is protein, and what type of protein?
A
- 35%
- Type 1 collagen
8
Q
What is the mineral that provides bone with rigidity?
A
Hydroxyapatite
9
Q
What is the epiphysis of a bone?
A
The ends
10
Q
What is the diaphysis of a bone?
A
The shaft
11
Q
What are the epiphyses made of?
A
Trabecular (spongey) bone
12
Q
What are the diaphyses made of?
A
Cortical bone
13
Q
How is cortical bone arranged?
A
In haversian systems
14
Q
What are osteoclasts?
A
They break down and reabsorb bone.
15
Q
Where do osteoclasts originate (lineage)?
A
Hematopoietic lineage
