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The secretion of osteocalcin (in an inactive form) by osteoblasts is controlled by positive feedback - AQA - A-Level Biology - Question 1 - 2018 - Paper 3
Question 1
The secretion of osteocalcin (in an inactive form) by osteoblasts is controlled by positive feedback. Use information from Figure 1 to explain why this is positive ... show full transcript
Worked Solution & Example Answer:The secretion of osteocalcin (in an inactive form) by osteoblasts is controlled by positive feedback - AQA - A-Level Biology - Question 1 - 2018 - Paper 3
Step 1
Use information from Figure 1 to explain why this is positive feedback.
Answer
Osteocalcin secretion leads to the release of insulin, which triggers more osteocalcin being secreted. This continuous cycle of increasing osteocalcin levels and the corresponding rise in insulin demonstrates a positive feedback loop, as the effect of osteocalcin accumulates with each cycle.