I am completing a medical vocab paper. It asked what is the Substance that regulates calcium. what is it?

http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/thyroid/pth.html

thank you

The substance that regulates calcium in the body is known as parathyroid hormone (PTH). PTH is produced by the parathyroid glands, which are located in the neck. This hormone plays a crucial role in maintaining calcium balance in the body.

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