Osteoblasts · Histology

What is the primary organic component of the bone matrix secreted by osteoblasts?

  1. Type II Collagen
  2. Type I Collagen
  3. Hydroxyapatite
  4. Aggrecan
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Correct answer: Type I Collagen

Type I collagen makes up approximately 90% of the organic bone matrix (osteoid). Osteoblasts synthesize and secrete procollagen, which is then cleaved and assembled into fibers extracellularly.

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