Which of the following hormones is produced by the parathyroid glands and plays a key role in regulating calcium levels in the blood?

A Parathyroid hormone-related protein (PTHrP)
B Calcitonin
C Parathyroid hormone (PTH) ✓
D Vitamin D

Explanation

Parathyroid hormone (PTH) is produced by the parathyroid glands and plays a crucial role in regulating calcium levels in the blood by stimulating the release of calcium from bones and increasing its absorption from the intestine.

Source

Berne and Levy Physiology
Hormones and Endocrine Markers Endocrinology Mineralocorticoids and Bone Health Medium MEDICAL Confidence: high