While visiting another country, you notice many individuals with iodine-deficiency goiters. Describe the feedback loop responsible for these goiters
What will be an ideal response
Upon detecting low levels of thyroid hormone in the blood, the hypothalamus uses a releasing hormone to signal to the anterior pituitary to produce thyroid stimulating hormone (TSH). The effect of TSH is to ramp up production of thyroid hormone in the thyroid gland. Iodine is required for functional thyroid hormone. Lack of iodine causes the continued effort by the thyroid to increase production (goiter) as the hypothalamus continues to stimulate TSH production.
You might also like to view...
Identify the following
What hormone is responsible for the ejection of milk from the mammary glands?
A. Follicle-stimulating hormone (FSH) B. Estrogen C. Prolactin D. Progesterone E. Oxytocin
What is the innermost layer of a artery wall called?
a. endothelium b. tunica media c. tunica externa d. vasa vasorum
During the act of drinking water, the desire for water is usually inhibited by
A. Distension of the stomach B. Hormones secreted by stomach cells C. Changes in intracellular fluid concentration D. Changes in extracellular fluid concentration