A chemical messenger emitted from one organism that activates a physiological or behavioral response in another is called what?
Placebo
Hormones
Pheromones
Sometimes, a man’s testosterone increases when he smells a shirt worn by a _________women?
Perspiring
Ovulating
Non-ovulating
Major Histocompatibility Complex (MHC) molecules are part of what system?
Immune system
Digestive system
Lymphatic system
In the coffee study, participants who held the hot coffee rated the hypothetical person as ____________?
Unaffectionate
Creative
Happier
Once attraction is confirmed, your bloodstream floods with what?
Norepinephrine
Adrenaline
Serotonin
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