8. Metabolic homeostasis concerns the thyroid gland. The thyroid is regulated by feedback loops involving which of the following?
a. the pituitary gland and two hormones
b. the hypothalamus, pancreas, and four hormones
c. the hypothalamus, the pituitary, and three hormones
d. the Islets of Langerhans and three hormones
e. the adrenal cortex and three hormones