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.
A Lifesaving Drug. Epinephrine pens, or EpiPens, can be lifesaving tools. The epinephrine (also called adrenaline) is a cardiac stimulant and is used for severe allergic reactions of all types, including food, drug, insect bites, and stings.Prescribed to those for whom the risk of anaphylactic shock due to allergic reaction is very high, it comes in the form of an auto-injector or âpenâ.he epinephrine (also called adrenaline) is a cardiac stimulant and is used for severe allergic reactions of all types, including food, drug, insect bites, and stings. Prescribed to those for whom the risk of anaphylactic shock due to allergic reaction is very high, it comes in the form of an auto-injector or âpenâ.