Question

multiple choice 2 points
in endochondral ossification, the precursor connective tissue is
embryonic mesenchyme
transitional epithelium
fibrous membranes
hyaline cartilage
fibrocartilage

Explanation:

Identify the core process

The question asks for the precursor connective tissue involved in endochondral ossification. Endochondral ossification is one of the two essential processes during fetal development of the mammalian skeletal system by which bone tissue is created.

Analyze the mechanism

In endochondral ossification, bone develops by replacing an existing model. This model is composed of hyaline cartilage, which is a specialized type of connective tissue. The cartilage model is gradually mineralized, broken down, and replaced by bone tissue.

Evaluate the options

• embryonic mesenchyme: This is the starting embryonic tissue that condenses to form the initial models, but it directly ossifies into bone during intramembranous ossification, not endochondral.
• transitional epithelium: This is an epithelial tissue type, not a connective tissue precursor for bone.
• fibrous membranes: These serve as the precursor templates for intramembranous ossification, not endochondral.
• hyaline cartilage: This is the specific precursor connective tissue model that is replaced by bone during endochondral ossification.
• fibrocartilage: This is a tough cartilage found in intervertebral discs and pubic symphyses, not the precursor model for long bone development.

Answer:

• embryonic mesenchyme
• transitional epithelium
• fibrous membranes
• hyaline cartilage (Correct answer)
• fibrocartilage