GENERAL HISTOLOGY

Detailed explanation-1: -Complete answer: b) Glucagon-insulin hormone is an antagonist to glucagon because it reacts opposite to the function of insulin. Insulin role is to maintain the glucose level in the blood stream whereas glucagon hormone is known for raising the concentration of glucose in blood.

Detailed explanation-2: -Insulin and glucagon, calcitonin and parathyroid hormone are antagonistic hormones because their actions are completely opposite. Glucagon increases blood glucose level and insulin decrease blood glucose level. Parathyroid hormone increases blood calcium level and calcitonin decrease the blood calcium level.

Detailed explanation-3: -The glucagon-insulin antagonism was maximally expressed when glucagon was present at low physiological concentrations. At equimolar doses it was only in the concentration range around 0.1 nM that glucagon and insulin became powerful antagonists; at higher levels glucagon was the dominant hormone.

Detailed explanation-4: -Insulin and glucagon are antagonistic hormones. Alpha cells secrete glucagon, beta cells secrete insulin. Glucagon facilitates the release of glucose into the bloodstream from the stored glycogen through a process of signal transduction.