Cortisol and insulin are synergistic in their actions.
a. true
b. false

b). False.

Explanation:

Synergistic effect represents interaction between two or more substances or factors to generate a combined effect higher than the sum of their effects when they function separately.

Cortisol is a hyperglycemic hormone that increases level of glucose in blood. It is secreted by adrenal gland during stress conditions, which increases level of blood sugar by producing of glucose from liver.

On the other hand, insulin is a hypoglycemic hormone that reduces level of glucose in blood. It is secreted by pancreas when blood sugar level becomes too high and decreases blood sugar level by promoting storage of glucose for future use.

As cortisol and insulin show opposite effects, they cannot be considered as synergistic in their actions.

Thus, the given statement is false.