Which of the following hormones plays a crucial role in the regulation of calcium homeostasis by increasing osteoclast activity?

A Parathyroid hormone (PTH) ✓
B Calcitonin
C Vitamin D
D Thyroid-stimulating hormone (TSH)

Explanation

Parathyroid hormone (PTH) is secreted by the parathyroid glands and plays a key role in maintaining calcium homeostasis by stimulating osteoclast activity, which leads to bone resorption and an increase in blood calcium levels.

Mnemonic

PTH = Pulls The Handle (on osteoclasts)

Source

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