Which hormone is responsible for the regulation of calcium homeostasis in the body, and what is its primary mechanism of action?

A Parathyroid hormone (PTH), increasing calcium absorption in the gut ✓
B Calcitonin, decreasing calcium release from bone
C Vitamin D, increasing calcium absorption in the gut
D Thyroid-stimulating hormone (TSH), increasing calcium release from bone

Explanation

Parathyroid hormone (PTH) plays a crucial role in maintaining calcium homeostasis by increasing calcium absorption in the gut, reducing calcium excretion in the urine, and releasing calcium from bone.

Mnemonic

PTH = Primary Thermostat for Homeostasis

Source

Berne and Levy Physiology
Hormones and Endocrine Markers Mineral Metabolism Calcium Homeostasis Medium MEDICAL Confidence: high