emotion is a physical response, the releasing of chemicals that have physical effects.
Splash, the cause leads to the consequence....
Adrenaline makes you clammy, takes the blood from your peripheries and non essential organs such as your gut, it redirects the blood to large muscle groups and the brain. Your heart rate increases, your resp rate increases, your eyes dilate to take in more information.
Those ARE the consequences of the CAUSE of what we call 'excited' or 'scared' or even 'agression'... the physical affects such as the gut losing the blood supply leads to the 'feeling' we have such as 'butterflies in the stomach'. Goosebumps are the result of long lost body hair that would have stood on end like a scared cat, the hair now gone we are left with the sensation and resulting raised bumps that so urge you to rub them....
The physical effects of the chenicals are the feelings we have. They are triggered by experiences, be it seeing danger, or an attractive mate.