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practiceQ

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practiceQ

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  1. A 70-year-old man presents to the physician because of bone pain. Serum alkaline phosphatase levels are elevated. A histologic examination shows haphazardly-oriented, prominent cement lines, which create a mosaic pattern of lamellar bone. Which of the following cell types is most likely involved in the initial lesion of his condition? a. Osteoblasts b. Osteoclasts c. Fibroblasts d. Chondrocytes e. Endothelial cells

  2. An infant born to a 22-year-old female meets all developmental milestones. His height corresponds to the 60th percentile. Osteoblasts near the growth plates of his long bones convert to osteocytes to remain connected to each other by: a. A tight junctions b. Hemidesmosomes c. Intermediate junctions d. Gap junctions e. Desmosomes

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