Bone Development Quiz
Questions: 16 · 10 minutes
1. In a cartilage model, central chondrocytes enlarge, the surrounding matrix calcifies, and the cells die. Which event most directly enables bone-forming cells to enter next?
Closure of the epiphyseal plate
Formation of articular cartilage over the diaphysis
Invasion by blood vessels in the periosteal bud
Conversion of osteocytes into chondrocytes
2. What happens near the beginning of intramembranous ossification?
Chondrocytes form columns between the epiphysis and diaphysis
A hyaline cartilage model expands from an epiphyseal plate
Osteoclasts hollow out a complete medullary cavity
Mesenchymal cells cluster and differentiate into osteoblasts
3. A developing flat bone of the skull forms directly within a vascular sheet of mesenchymal tissue, without a cartilage model. Which process is occurring?
Interstitial cartilage growth
Endochondral ossification
Intramembranous ossification
Secondary bone remodeling
4. Where does the primary ossification center of a typical developing long bone appear?
Within the articular cartilage
In the diaphysis
At both ends of the bone simultaneously
Within the future joint cavity
5. A growth-plate sample shows chondrocytes dividing rapidly and arranged in columns. Which zone is being observed?
Zone of resting cartilage
Zone of calcification
Zone of proliferation
Zone of ossification
6. During development, which cells resorb bone and help enlarge the medullary cavity?
Chondrocytes
Fibroblasts
Osteoblasts
Osteoclasts
7. A mature bone cell is enclosed in a lacuna and connected to nearby cells through canaliculi. What is its main identity and role?
An osteoclast that dissolves mineralized matrix
A chondroblast that forms the cartilage model
An osteoblast that produces synovial fluid
An osteocyte that helps maintain and sense changes in bone matrix
8. During fracture repair, a fibrocartilaginous callus is gradually replaced by bone. This replacement most closely resembles which developmental process?
Appositional cartilage growth
Intramembranous ossification
Endochondral ossification
Articular cartilage maintenance
9. Which structure serves as the initial template during endochondral ossification?
A hyaline cartilage model
A sheet of dense connective tissue
A layer of mature compact bone
A network of calcified tendons
10. An osteoblast has secreted osteoid. What has it produced?
A mature osteon containing a central canal
Unmineralized organic bone matrix
Calcified cartilage within the growth plate
A fluid-filled space inside the medullary cavity
11. Where do secondary ossification centers usually develop in a long bone?
In the epiphyses
Along the entire periosteal surface
Only within the metaphysis
In the center of the medullary cavity
12. After endochondral ossification is complete in a mature long bone, where does hyaline cartilage normally remain?
Throughout the medullary cavity
As an open plate across each metaphysis
As the outer fibrous layer of the periosteum
On the articular surfaces at the ends of the bone
13. An X-ray of an adult long bone shows an epiphyseal line rather than an open growth plate. What does this indicate?
The primary ossification center has not formed
The growth plate has closed and been replaced by bone
The medullary cavity has filled with compact bone
The articular cartilage has become bone
14. A child's long bone is increasing in diameter. Which activity most directly contributes to this appositional growth?
Periosteal osteoblasts deposit new bone on the outer surface
Osteocytes convert into chondroblasts in the medullary cavity
Chondrocytes divide within the articular cartilage
Epiphyseal osteoclasts lengthen the growth plate
15. An injury severely damages the epiphyseal plate of a growing long bone. Which process is most directly at risk?
Increase in the bone's length
Maintenance of articular cartilage at the joint surface
Repair of microscopic cracks by remodeling
Attachment of tendons to the periosteum
16. A student is asked to locate the metaphysis of a long bone. Which region should the student identify?
The cartilage covering the joint surface
The transition between the diaphysis and an epiphysis
The hollow center of the shaft
The fibrous membrane surrounding the entire joint