Question

in endochondral ossification, ______ enlarge and send signals that trigger calcific cartilage matrix.
osteoblasts
osteoclasts
chondrocytes
osteocytes
question 4 (1 point)
________ cartilage covers the ends of long bones whereas ____cartilage is fo vertebral discs.
fibrocartilage; elastic
hyaline; fibrocartilage
elastic; hyaline
fibrocartilage; hyaline

Explanation:

• First question:
• Osteoblasts are cells that build bone.
• Osteoclasts break down bone.
• Osteocytes are mature bone cells.
• Chondrocytes are cartilage cells. In endochondral ossification, chondrocytes enlarge and signal for cartilage matrix calcification.
• Second question:
• Hyaline cartilage covers the ends of long bones (articular cartilage).
• Fibrocartilage is found in vertebral discs (provides strength and shock - absorption).
• Elastic cartilage is more flexible and found in structures like the ear.

Answer:

• First question: Chondrocytes
• Second question: hyaline; fibrocartilage