Discuss The Development And Growth Of Bones

Question 1

What are the three types of bone cells?

Answer 1

1. Osteoblasts
2. Osteocytes
3. Osteoclasts

Question 2

What do osteoblasts do?

Answer 2

Bone - building cells

They deposit new bone tissue around themselves, they eventually become trapped in tiny pockets in the growing bone, and differentiate into oestocytes

Question 3

What do oesteocytes do?

Answer 3

Mature bone cells

They do not divide and area responsible for bone formation and calcium homeostasis

Question 4

What do oestoclasts do?

Answer 4

Bone reabsorbing cells

Breakdown bone releasing calcium and phosphate. As new bone cells are made, old ones are destroyed by oestoclasts

Question 5

Explain oestogenesis

Answer 5

Stage 1: oestoblasts secret osteoids ( protein)
- replaces cartilage in foetus

Stage 2: calcium and phosphate laid down
- progressively calcifying it, converting it to hard rigid mature bone

Stage 3: osteoblasts form a matrix
- cells become trapped and become osteocytes