- I. Adrenaline (also known as epinephrine) is a hormone released during stress or excitement, triggering the 'fight or flight' response, associated with states like anger, fear, and danger. (I-A) - II. Estrogen is the primary female sex hormone, crucial for the development and regulation of the female reproductive system and secondary sexual characteristics. (II-C) - III. Insulin is a hormone produced by the pancreas that regulates blood glucose levels by promoting the uptake of glucose into cells. (III- D) - IV. Pheromones are chemical signals released by animals that can influence the behavior or physiology of others of the same species, often involved in attracting mates via the sense of smell. (IV-B)