SAT Subject Biology Practice Question 55: Answer and Explanation

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Question: 55

4. Which of these is the MOST LIKELY result of blood calcium levels falling too low?

A. The thyroid gland releases calcitonin, which binds to bone cells.
B. The parathyroid glands release PTH, which binds to kidney cells.
C. The thyroid gland releases thyroid hormone, which binds to small intestine cells.
D. The pancreas releases glucagon, which binds to liver cells.
E. The pituitary gland releases growth hormone, which binds to bone cells.

Correct Answer: B


Parathyroid hormone (PTH) is secreted in response to low blood calcium levels. This hormone acts on the kidneys to take up more calcium and causes bones to release calcium into the blood.

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