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1 BIOLOGY MCQS

Which gland controls calcium levels in the blood?

  • Thyroid
  • Parathyroid
  • Adrenal medulla
  • A and B
Correct Answer: D. A and B

Detailed Explanation

The calcium level in the blood is controlled by both the thyroid and parathyroid glands.




  • The parathyroid glands, located behind the thyroid, produce parathyroid hormone (PTH). PTH increases calcium in the blood by:




    • Releasing calcium from bones




    • Increasing calcium absorption from the intestines




    • Reducing calcium loss through the kidneys






  • The thyroid gland produces calcitonin, which slightly lowers blood calcium when it becomes too high.




Together, these glands maintain a balanced calcium level, which is very important for:




  • Muscle contractions




  • Nerve signaling




  • Blood clotting




  • Strong bones and teeth




The adrenal medulla does not affect calcium levels; it mainly produces hormones like adrenaline.


In short, both thyroid and parathyroid glands work together to keep calcium levels stable in the blood, which is crucial for healthy body function and bone strength.

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