Which hormone has functions that are meant to protect the organism against the effects of a stressor and to focus on energy or regain balance in the face of an acute challenge to homeostasis?

Glucocortocoid hormones performed above roles.

Explanation:

Genreally they are any steroid hormones produce by the Cortex of adrenal glands with anti-inflammatory and immunosuppressive activities ...

They coordinate the withdrawal of immune cells from the blood and storage sites to tagger ares for immune reactions

They are also important for providing resistance against stress and resistance to changes in environmentalal factors.