The head of a Roman snail, four tentacles well visible. [RN] Observing a snail crawling around, the view is immediately attracted by its head, orienting itself in its surroundings using the tentacles. The snail feels its environment, touches an obstacle and withdraws the tentacle.
One of these hormones is epinephrine, which can be defined as a hormone secreted by the adrenal medulla in response to short-term stress. Epinephrine is also called adrenaline, and you may have heard of this term before.
Difference Between Epinephrine and Norepinephrine. Epinephrine and norepinephrine are very similar substances. The two are closely related hormones or neurotransmitters that are almost identical chemically and structurally. In laymanâs terms, epinephrine is otherwise known as adrenaline while norepinephrine is colloquially known as noradrenaline. Still, the two have some distinct functional differences.