Which of the Following Is the Most Likely Explanation for Hypothyroidism

question 9

Multiple Choice

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 T4
• B) hyposecretion of TSH
• C) hypersecretion of MSH
• D) a decrease in the thyroid secretion of calcitonin

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Definitions:

Thyroid

A gland in the neck that produces hormones regulating metabolism, energy generation, and growth.

Glucagon

A hormone produced by the pancreas that raises blood glucose levels, acting as an important counter-regulatory hormone for insulin.

Progesterone

A hormone produced in the ovaries, placenta, and adrenal glands, important for regulating menstruation and maintaining pregnancy.

Autocrine Chemical Messenger

A signaling molecule released by a cell that binds to receptors on the same cell, leading to a response in the cell itself.