An individual has hyperthyroidism because the follicle cells are hypersecreting T3 and T4. Increased T3/T4 levels in the blood results in:
a) further stimulus to produce thyroid hormone.
b) inhibition of parathyroid hormone release from the parathyroid glands.
c) suppression of thyroid-stimulating hormone from the anterior pituitary.
d) increased secretion of thyroxine-releasing hormone from the hypothalamus.