How do hormones from the thyroid and parathyroid regulate the calcium concentration of the blood?

Question:How do hormones from the thyroid and parathyroid regulate the calcium concentration of the blood?

1.Calcitonin lowers blood calcium; parathyroid hormone raises blood calcium.

2.Parathyroid hormone lowers blood calcium; calcitonin raises blood calcium.

3.Thyroxine and triiodothyronine together regulate calcium levels, as needs dictate.

4.Both parathroid hormone and the three thyroid hormones function to regulate blood calcium levels.


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