Topics:
Animal Physiology, Animal Refresher
Antagonistic Hormone Pairs
Which of the following pair of hormones act antagonistic to each other-
- Calcitonin & PTH
- Aldosterone & Atrial natriuretic peptide (ANP)
- Insulin & Glucagon
- All the above — Correct Answer
Explanation:
Correct Answer: All the above
All three pairs are classic antagonistic hormone pairs that together maintain homeostasis.
Antagonistic Pairs Explained
- Calcitonin (thyroid C-cells) vs. PTH (parathyroid glands):
- Calcitonin → ↓ blood Ca²⁺ (promotes Ca²⁺ deposition in bone, inhibits osteoclasts)
- PTH → ↑ blood Ca²⁺ (increases renal Ca²⁺ reabsorption, activates osteoclasts, stimulates Vitamin D activation)
- Aldosterone (adrenal cortex) vs. ANP (cardiac atria):
- Aldosterone → ↑ Na⁺ reabsorption → ↑ blood volume/pressure
- ANP → ↑ Na⁺ secretion → ↓ blood volume/pressure
- Insulin (β-cells of islets) vs. Glucagon (α-cells of islets):
- Insulin → ↓ blood glucose (promotes glucose entry into cells)
- Glucagon → ↑ blood glucose (glycogenolysis + gluconeogenesis in liver)
- Somatostatin (δ-cells) inhibits both insulin and glucagon — it modulates, not opposes one
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
