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.
Norepinephrine is a neurotransmitter secreted by neurons in the sympathetic nervous system. This chemical is secreted in response to stress, which triggers the 'fight or flight response.' The release of norepinephrine causes several changes that help our body to work more efficiently.
Epinephrine is a hormone and a neurotransmitter that's also known as adrenaline. As an injectable medicine, such as EpiPen, epinephrine is used to treat life-threatening allergic reactions (anaphylaxis) caused by foods, insect bites, and other allergens.The goal of injection is to deliver the epinephrine into muscle tissue.). Do not inject epinephrine into the buttocks or any other part of your body. After using an auto-injector, some epinephrine may still remain in the device. This is typical and doesn't mean you did not receive a full dose.