List three ways endocrine glands are stimulated to release hormones.

Which hormone is incorrectly paired with its action?a. oxytocin—stimulates uterine contractions during childbirthb. thyroxine—inhibits metabolic processesc. ACTH—stimulates the release of glucocorticoids by the adrenal cortexd. melatonin—affects biological rhythms and seasonal reproduction

Explain how the hypothalamus controls body functions through its action on the pituitary gland. How does control of the anterior and posterior pituitary differ?

True or False: In hormone systems, negative feedback occurs when the presence of a hormone inhibits release of the hormone.

What do steroid and peptide hormones typically have in common?a. their solubility in cell membranesb. their requirement for travel through the bloodstreamc. the location of their receptorsd. their reliance on signal transduction in the cell

Compare and contrast the modes of action of lipid-soluble and water-soluble hormones.

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?a. greater production of T3 than of T4b. hyposecretion of TSHc. hypersecretion of MSHd. a decrease in the thyroid secretion of calcitonin

In a glucose tolerance test, periodic measurements of blood glucose level are taken after a person drinks a glucose-rich solution. Using the hypothetical graph below, compare and contrast the results of the test for the diabetic and the healthy individual.

Why is the observation that one hormone may bind to more than one type of receptor important?