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One function of the skeletal system is to maintain blood calcium levels within a certain range....

One function of the skeletal system is to maintain blood calcium levels within a certain range. If blood calcium levels fall below an acceptable level, the skeletal system will respond to bring blood calcium levels back into this range. Describe how the skeletal system accomplishes this. In your description be sure to include the roles of the specific cell and hormone involved in this process. In addition, explain how the structure of this particular cell complements its function.

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Answer #1

The skeletal system plays an important role in the regulation of blood Ca+2 levels.
The bone contains Osteoclasts and Osteoblasts.
Osteoblasts = Bone forming cells that absorb calcium from the blood
Osteoclasts = Bone digesting cells that release calcium into the blood.

Blood Ca+2 levels are regulated by two endocrine hormones.
1. Calcitonin decreases blood Ca+2 levels by inhibiting osteoclast activity. It also inhibits renal tubular reabsorption of Ca+2.


2. Parathyroid hormone (PTH) elevates blood Ca+2 levels by promoting osteoclast activity. It also promotes renal tubular reabsorption of Ca+2.

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