Which hormone is responsible for the regulation of calcium homeostasis in the body, particularly in the context of bone resorption and renal calcium reabsorption?

A Parathyroid hormone (PTH) ✓
B Calcitonin
C Vitamin D
D Osteocalcin

Explanation

Parathyroid hormone (PTH) plays a critical role in maintaining calcium homeostasis by regulating bone resorption and renal calcium reabsorption.

Mnemonic

PTH = Primary regulator of calcium 'Home'

Source

Guyton and Hall Textbook of Medical Physiology
Hormones and Endocrine Markers Endocrinology Mineralocorticoids and Bone Metabolism Easy MEDICAL Confidence: high