activating

During the process, the brain also floods with the neurotransmitter dopamine, creating feelings of euphoria and activating the brain's reward system.

The key is the ligand — that’s the general word for whatever chemical messenger or signaling molecule attaches to the receptor, activating it.

In the hours and days since the start of the fire, Black Angelenos immediately came together to organize for Altadena, activating mutual aid networks.

"This represents a completely new approach, activating T cells to improve neurological outcomes after cardiac arrest," said Kim.

However, upon gastrointestinal mucus fluctuations caused by dietary changes or antibiotics, for example, the fungus becomes visible to the immune system by activating the production of a cytokine called IL-33.