Ahormone called thyroid-stimulating hormone (tsh) is secreted
by the anterior pituitary gland and acts on the thyroid gland to
increase the secretion of thyroid hormones. thyroid hormones on the
other hand, have a negative-feedback effect on tsh secretion. for a
person having normal thyroid function, the rate at which tsh and
thyroid hormones are secreted remains within a normal range of
concentrations. however, in some people the immune system begins to
produce an abnormal substance that functions like tsh. predict what
that substance will do to the rate of thyroid stimulating hormone
secretion and the rate of thyroid hormone secretion.