Bone

Question 1

What does bone develop from?

Answer 1

Mesenchyme

Question 2

What is bone composed of?

Answer 2

1. cells
2. matrix
3. mineral

Question 3

Bone mineral

Answer 3

calcium hydroxyapatite

Mineral and collagen fibers give bone resilience and hardness

Question 4

Bone cells & their function

Answer 4

Osteoblasts - synthesize the organic components of the bone matrix

Osteoclasts - reabsorb bone (bone remodelling)

Osteocytes - maintain bone matrix

Question 5

Bone Development

Answer 5

a) Primary (immature, woven)

b) Secondary (mature, lamellar) –> collagen fibers organized into plates (lamellas)

Question 6

Subclassification of Lamellar Bone

Answer 6

a) dense (compact)
b) spongy (cancellous) [bone marrow in long bone]

Same composition, but spongy has cavities within it

Question 7

Two types of bone marrow?

Answer 7

Red

Yellow - fatty

Question 8

What is the dense tissue that covers bone?

Answer 8

Periosteum

Question 9

How are flat bones created? Examples?

Answer 9

Intramembranous Ossification

skull, maxilla, mandible

Question 10

How are long bones created? Example?

Answer 10

Enchondral Ossification

femur