Bone

Question 1

Osteoblasts

Answer 1

Form bones
Cuboidal cell body
Secrete collagen and ground substance
At surface of bone tissue
Form matrix and collagen fibers, but can’t divide

Question 2

Osteocytes

Answer 2

Flattened spindle shape
Within lacunae in lamellae
Mature cells that no longer secrete matrix

Question 3

Osteoclasts

Answer 3

Howship’s lacuna
Reabsorb bone cells
Release lysosomes
Multinuclear cell
Present at area of bone where it is removed
Huge cells from fused monocytes, function in bone resorption at surfaces such as endosteum

Question 4

Types of bone tissue

Answer 4

Woven bone

Lamellar bone

Question 5

Woven bone

Answer 5

Cells randomly arranged

Replaced by secondary bone in adults

Question 6

Lamellar bone

Answer 6

Compact - weight bearing and structural support

Spongy - Marrow cavity , trabecular and light weight

Question 7

Trabecular bone

Answer 7

Lattice of plates of trabecular (bone) alone stress line
Filled with red bone marrow
Present at ends of long bones and inside flat bones
Sternum, side of skull, ribs and hipbones

Question 8

Compact bone

Answer 8

Hard layer of bone
Makes up shaft of long bones and external layer
Osteon/haversian system - Structural unit, parallel to bone
Concentric lamellae - collagen fibres arranged randomly

Question 9

Osteoprogenitor cells

Answer 9

Undifferentiated cells found in inner layer of periosteum and endosteum