Pheromones are odorous substances that are understood to be “chemical messengers”
Pheromones - the collective name of substances - products of external secretion secreted by some species of animals and humans, and providing chemical communication between individuals of the same species.

Pheromones are biological markers of their own kind, volatile chemosignals that control neuroendocrine behavioral reactions, development processes, as well as many processes associated with social behavior and reproduction.

Pheromones can modify the behavior, physiological and emotional state or metabolism of other individuals of the same species.

Pheromone signals are recognized by a special organ in the nose called the vomeronasal organ (VNO, or Jacobson’s Organ). The vomeronasal organ is connected to the limbic system of the brain, which is also known as the “seat of emotions” (which can influence social and sexual behavior in animals of the same species). VNO is a separate receptor organ and should not be confused with the sense of smell. The VNO is a part of the brain (separate from the olfactory system), which has nerves and other connecting structures in the brain. VNO is directly related to brain structures that regulate the production of sex hormones and control sexual behavior.

The olfactory system which we are familiar with, processes ordinary airborne smells, whereas the VNO can pick up “chemical signals” (like pheromones from the same species) and passes them along to the brain for processing.
This is what causes the changes in sexual and social behavior (affecting limbic region, “seat of emotions”). It is this organ that processes these chemo-signals and can change the way people interact with each other which is why pheromones and attraction are often linked.

• Pheromones are also known as “ectohormones” because they are hormones but act outside the body.


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