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

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

List three ways endocrine glands are stimulated to release hormones.

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

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?

The relationship between the insect hormones ecdysteroid and PTTH is an example ofa. an interaction of the endocrine and nervous systems.b. homeostasis achieved by positive feedback.c. homeostasis maintained by antagonistic hormones.d. competitive inhibition of a hormone receptor.

If a person has a pituitary tumor that is oversecreting TSH, would this person be likely to have goiter as a symptom? Explain.