BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Parathyroid hormone (PTH) is essential for the physiologic maintenance of mineral homeostasis. PTH regulates the mineral transport in bone and kidney and through its secondary actions on mineral transport in intestine (mediated by 1.25 (OH)2D). Calcitonin, in many ways, acts as a physiologic antagonist to PTH.

Detailed explanation-2: -Parathyroid hormone (PTH) and Calcitonin Calcitonin and PTH are referred to as antagonistic hormones, as their actions are diametrically opposite. While calcitonin is secreted when blood calcium level is extremely high, PTH is secreted when the blood calcium level is too low.

Detailed explanation-3: -Calcitonin, also renowned as thyrocalcitonin (TCT), is an antagonist of parathyroid hormone (PTH).

Detailed explanation-4: -Insulin and glucagon, calcitonin and parathyroid hormone are antagonistic hormones because their actions are completely opposite.