7.4 Hormone Interactions

Question 1

What are the three types of hormone interactions?

Answer 1

Synergism, permissiveness, antagonism.

Question 2

What is the idea behind synergism?

Answer 2

combined effect of interacting hormones is greater than the sum of their individual effects.

Question 3

Example of synergism involving Epinephrine and glucagon?

Answer 3

Epinephrine and glucagon both elevate blood glucose levels. When present together, their combined effect is greater than their individual effects.

Question 4

What is the idea behind permissiveness?

Answer 4

when one hormone is needed for another hormone to exert its full effect, even though the second hormone has no direct effect on its own.

Question 5

Example of permissiveness involving the Thyroid hormone and reproductive system?

Answer 5

Thyroid hormone is required for the proper maturation of the reproductive system, even though thyroid hormone itself does not directly stimulate reproductive maturation.

Question 5

What is the idea behind antagonism?

Answer 5

when one hormone opposes the action of another hormone, diminishing its effectiveness.

Question 6

What is an example of antagonistic hormones involving insulin and glucagon?

Answer 6

Insulin lowers blood glucose levels, while glucagon and growth hormone raise blood glucose levels. They have opposing effects.

Question 7

How can antagonistic hormones work if they don’t compete for the same receptor (2)?

Answer 7

They can act through different metabolic pathways or one hormone may decrease the number of receptors for the opposing hormone.