Question

regulation of blood calcium levels
the maintenance of normal blood calcium levels is regulated by
a positive feedback loop a negative feedback loop calcitonin levels parathyroid hormone levels
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Explanation:

The maintenance of normal blood - calcium levels is regulated by a negative feedback loop. When blood calcium levels are high, calcitonin is released to lower them, and when levels are low, parathyroid hormone is released to increase them. This is a classic example of a negative feedback mechanism in the body to maintain homeostasis.

Answer:

a negative feedback loop, calcitonin levels, parathyroid hormone levels