Question 11

Antagonistic effect

An antagonistic effect occurs when two hormones have opposing actions on a particular physiological function, effectively balancing each other out in the body.

A) Antagonistic effect

This option is correct as it specifically describes the interaction where one hormone counteracts the action of another. For example, insulin lowers blood glucose levels while glucagon raises them, illustrating a classic antagonistic relationship.

B) Permissive effect

The permissive effect refers to a scenario where one hormone enhances the action of another hormone, rather than opposing it. This interaction does not fit the question's requirement for opposite effects, making this option incorrect.

C) Synergistic effect

A synergistic effect occurs when two hormones work together to produce a greater effect than either would achieve alone. This is contrary to the concept of opposite effects, thus rendering this option incorrect.

D) Inhibitor effect

The term "inhibitor effect" is somewhat vague and does not specifically denote a type of hormonal interaction described in endocrinology. It does not refer to a defined relationship where two hormones have opposite effects, so it is not the correct choice.

Conclusion

The antagonistic effect is the only option that accurately describes the interaction of two hormones having opposite effects. All other options either describe different types of hormonal interactions or do not apply to the concept of opposition, affirming that A is the definitive correct answer.