Question

Which of the following hormones have antagonistic (opposing) effects?

• A. Thyroxine and calcitonin
• B. Insulin and glucagon
• C. Growth hormone and epinephrine
• D. ACTH and glucocorticoids

Answer 1

The correct option is B Insulin and glucagon

Insulin and glucagon are produced by beta and alpha cells of islets of Langerhans of pancreas respectively. Both acts antagonistically to each other. Insulin decreases the blood glucose level, while glucagon increases blood glucose level.

Glucagon causes the liver to convert stored glycogen into glucose, which is released into the bloodstream and insulin regulates the metabolism of carbohydrates and fats by promoting the absorption of glucose from the blood to skeletal muscles and fat tissues and by causing fat to be stored rather than used for energy. Thus, glucagon and insulin are part of a feedback system that keeps blood glucose level stable.

Therefore, the correct answer is option B.