Question

in the hpa axis, which hormone does the pituitary use to signal the adrenal cortex?
cortisol
norepinephrine
acth
epinephrine

Explanation:

In the Hypothalamic - Pituitary - Adrenal (HPA) axis, the pituitary gland secretes Adrenocorticotropic hormone (ACTH) to signal the adrenal cortex to produce cortisol. Cortisol is the end - product hormone of the HPA axis response. Norepinephrine and epinephrine are not the hormones from the pituitary to the adrenal cortex in the HPA axis pathway.

Answer:

C. ACTH