Hormones are small molecules that coordinate activity between cells and systems in the body. They control both short-term responses like the fight or flight response through adrenaline, and long-term processes like reproduction and development. Hormones influence a wide range of behaviors from social bonding and aggression to mating and camouflage. They work by binding to receptors on cells and triggering changes like increased or decreased activity of enzymes and gene expression. The endocrine system produces hormones that are released into the bloodstream to target cells and tissues throughout the body.

1. Animal Behavior: Hormonal Control ANIMALEHAVIOR LEC 3 ANIMAL BE ANIM Animal Behavior, Lec. 8, BIOL 4518