Which hormone is released during a fight causing prolonged aggression?

Norepinephrine is the correct answer because it is a neurotransmitter and hormone that plays a significant role in the body’s fight-or-flight response. When an individual perceives a threat or engages in a fight, norepinephrine is released, leading to various physiological changes such as increased heart rate, heightened alertness, and enhanced energy availability. These changes support aggressive behavior and prolonged responses to stressful situations.

In the context of aggression, norepinephrine helps to prepare the body to confront or escape from danger, making it instrumental in a fight scenario. It is involved in the central nervous system's activation that gears the body toward aggression, enabling the individual to respond vigorously.

Other hormones like testosterone are indeed associated with aggression but primarily influence baseline levels of aggressive behavior rather than acting as acute responders in the moment of a fight. Estrogen and progesterone are typically linked to reproductive behaviors and physiological processes related to the female reproductive cycle, rather than immediate fight response mechanisms.