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Broken bones are repaired by cells called osteoclasts and osteoblasts.Osteoblasts secrete a hormone called osteocalcin in an inactive form. Osteocalcin is a protein.The active form of osteocalcin binds to a receptor on beta (β) cells in the pancreas, stimulatingthem to release insulin. Osteoblasts have receptors for insulin.The diagram shows how the production of osteocalcin by osteoblasts is controlled by positivefeedback.The secretion of osteocalcin (in an inactive form) by osteoblasts is controlled by positivefeedback.Use information from the diagram to explain why this is positive feedback.

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