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 TSH
D) hypersecretion of MSH
E) a decrease in the thyroid secretion of calcitonin

Question

Quizplus · Accepted Answer

Hypothyroidism is typically caused by a decrease in thyroid hormone production, which can be due to a variety of factors. One common cause is a deficiency in thyroid stimulating hormone (TSH), which is produced by the pituitary gland and stimulates the thyroid gland to produce thyroid hormones. If there is a hyposecretion of TSH, this can result in decreased thyroid hormone production and hypothyroidism. However, if there was hypersecretion of TSH, it would actually result in increased thyroid hormone production and hyperthyroidism. The other choices are not as likely to be the cause of hypothyroidism in a patient with normal iodine levels.

Which of the Following Is the Most Likely Explanation for Hypothyroidism