Sally is having difficulty losing weight. She has noticed that her skin is dry, and she is tired all the time. Her doctor suspects that her thyroxine levels are low and is going to run a screening test for the hormone released from the pituitary that stimulates the thyroid gland to make thyroxine. What test will Sally's doctor order?

MCQs on the physiological processes that occur within the human body, with particular attention on enzyme activity, cell signaling, metabolic processes, protein synthesis, and movement.