Interstitial Growth · Histology

Which factor is a major stimulator of chondrocyte mitosis during interstitial growth?

  1. Insulin-like Growth Factor 1 (IGF-1)
  2. Parathyroid hormone (Parathormone)
  3. Bone morphogenetic protein 2 (BMP-2)
  4. Calcitonin (Thyrocalcitonin)
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Correct answer: Insulin-like Growth Factor 1 (IGF-1)

Growth hormone stimulates the production of IGF-1, which acts directly on chondrocytes in the proliferative zone. This signaling pathway is the primary driver of longitudinal skeletal growth during childhood.

Difficulty: Medium Question 13 of 20

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