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.
Norepinephrine Epinephrine. Norepinephrine, also known as noradrenaline, is a neurotransmitter found in the sympathetic nervous system. The sympathetic nervous system stimulates the heart, blood vessels, sweat glands, the large internal organs, and the adrenal medulla in the brain.he amino acid tyrosine, found in high concentrations in cheese, is converted by specific reactions into at least two neurotransmitters â norepinephrine and dopamine. Norepinephrine is produced from dopamine, with the help of the amino acids phenylalanine, lysine, and methionine.