Bone Growth and Cartilage Development

The video explains the process of bone growth, focusing on bone widening and interstitial lengthening. It details the role of the epiphysial plate, which consists of four zones: resting cartilage, proliferating cartilage, hypertrophic cartilage, and calcified cartilage. The video describes how chondrocytes proliferate and mature, leading to bone elongation. The process continues until the epiphysial plate closes, resulting in adult stature.

Which bones primarily undergo interstitial lengthening?

• Bones of the appendages

• All bones

• Vertebral bones

• Cranial bones

What is the primary function of the epiphysial plate?

• To widen bones

• To lengthen bones

• To strengthen bones

• To protect bones

What type of cartilage is found in the zone of resting cartilage?

• Hyaline cartilage

• Calcified cartilage

• Fibrocartilage

• Elastic cartilage

In which zone do chondrocytes mature and enlarge?

• Zone of calcified cartilage

• Zone of hypertrophic cartilage

• Zone of proliferating cartilage

• Zone of resting cartilage

What happens to the cartilage matrix in the zone of calcified cartilage?

• It dissolves

• It thickens

• It calcifies

• It becomes more elastic

Which cells break down calcified cartilage?

• Fibroblasts

• Osteoclasts

• Chondrocytes

• Osteoblasts

What is the result of chondrocyte proliferation?

• Bone lengthening

• Bone widening

• Bone thickening

• Bone shortening

What marks the end of bone elongation?

• Formation of a new epiphysial plate

• Closure of the epiphysial plate

• Increase in chondrocyte number

• Expansion of lacunae

What is left behind when the epiphysial plate closes?

• A new bone layer

• An epiphyseal line

• A cartilage layer

• A growth plate