The level of cortisol in the body is controlled by negative feedback.
The diagram shows how this takes place.

Which numbers on the diagram represent the hormones ACTH and cortisol?
2=cortisol2 = \text{cortisol}2=cortisol and 3=ACTH3 = \text{ACTH}3=ACTH
1=ACTH1 = \text{ACTH}1=ACTH and 3=cortisol3 = \text{cortisol}3=cortisol
3=ACTH3 = \text{ACTH}3=ACTH and 4=cortisol4 = \text{cortisol}4=cortisol
2=ACTH2 = \text{ACTH}2=ACTH and 3=cortisol3 = \text{cortisol}3=cortisol