To propose: A revised model to depict the effect on Ca 2+ homeostasis if bone cells are unable to respond to PTH (parathyroid hormone). Introduction: Skin cells in the mammals that are receiving regular exposure to sunlight produces vitamin D from the precursor 7-dehydrocholesterol. Blood Ca 2+ concentration does not decrease due to the secretion of parathyroid hormone. Bone cells release extra Ca 2+ from the bones thereby increasing the concentration of calcium in the blood.

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Chapter 50.4, Problem 1CS

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To propose: A revised model to depict the effect on Ca²⁺ homeostasis if bone cells are unable to respond to PTH (parathyroid hormone).

Introduction: Skin cells in the mammals that are receiving regular exposure to sunlight produces vitamin D from the precursor 7-dehydrocholesterol. Blood Ca²⁺ concentration does not decrease due to the secretion of parathyroid hormone. Bone cells release extra Ca²⁺ from the bones thereby increasing the concentration of calcium in the blood.

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