Bone remodeling involves two hormones; one of these hormones activates the cells which cause Bone Resorption and one of these hormones causes Bone Deposition and an increase in Bone Mass. Which of the following statements is true? 6. A. PTH causes the osteoblasts to increase bone mass. B. PTH causes an increase in bone mass and a decrease in plasma Calcium. C. Calcitonin causes an increase in bone mass and a decrease in plasma Calcium. D. Calcitonin activates the osteoclasts and subsequently decreases bone mass.

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