Parathyroid hormone (PTH) is the principle hormone in regulating blood levels of Blank______.Multiple choice question.vitamin Doxygencalciumglucose

To answer the multiple-choice question regarding parathyroid hormone (PTH):

Answer

Parathyroid hormone (PTH) is the principal hormone in regulating blood levels of calcium.

Explanation

PTH is produced by the parathyroid glands and plays a crucial role in maintaining calcium homeostasis in the body. When blood calcium levels drop, PTH is secreted, which then acts to increase calcium levels by stimulating the release of calcium from bones, increasing calcium absorption in the intestines (indirectly by promoting vitamin D activation), and reducing calcium loss in urine. The other options (vitamin D, oxygen, and glucose) are not directly regulated by PTH.