The situation that would NOT help the body regain homeostasis is:
An individual's thyroid gland releases calcitonin to prevent calcium loss in bones when her body is experiencing a loss of bone density.
Calcitonin is indeed involved in calcium regulation, helping to lower blood calcium levels and promoting calcium deposition in bones. However, if the body is experiencing a loss of bone density, it suggests that there is already insufficient calcium in the bones, and simply releasing calcitonin would not address the underlying issue of bone density loss. Instead, the body might need additional mechanisms, such as increased calcium intake or other hormones like parathyroid hormone (PTH) to regulate calcium levels more effectively.