Question

Ca${}^{2+}$ level is controlled by

• A. Adrenal cortex
• B. Hypothalamus
• C. Pituitary
• D. Thyroid and parathyroids

Answer 1

The correct option is D Thyroid and parathyroids

The blood calcium level has to be in a particular range. When the blood calcium level rises above the normal range, thyroid secretes a hormone named calcitonin which reduces the blood calcium concentration to the normal range. When the blood calcium level falls down below the normal range, parathyroid secretes a hormone named parathyroid hormone which increases the blood calcium concentration to the normal range.

So thyroid and parathyroid controls the blood calcium level