W Hich of the Following is an Example of Primary

Question

W hich of the following is an example of primary hypothyroidism?
A) Defects in the TRH receptor
B) Defects in TSH structure
C) Traum atic lesion of the hypophyseal stalk
D) Defects in TRH secretion
E) Lack of iodine in the diet

Accepted Answer

Lack of iodine in the diet directly affects the thyroid gland's ability to produce thyroid hormones, leading to primary hypothyroidism. The other options involve issues with the hypothalamus or pituitary gland, which would lead to secondary or tertiary hypothyroidism.