a condition characterized by excessive production of the thyroid hormone
sever form of this disorder is called thyrotoxicosis
hypothyroidism
a condition characterized by diminished production of the thyroid hormone
thyroid-stimulating hormone (TSH)
an endogenous substance secreted by the pituitary gland that controls the release of thyroid gland hormones and is necessary for the growth and function of the thyroid gland
as drug preparations, TSH increases the uptake of radioactive iodine in the thyroid and the secretion of thyroxine by the thyroid gland
thyroxine (T4)
principle thyroid hormone that influences the metabolic rate
triiodothyronine (T3)
a secondary thyroid hormone that also affects body metabolism