When a body receives a stimulus, the nervous system is called to release adrenaline. under what circumstances can this happen?

Adrenaline is the hormone produced by the medulla and some of the neurons of the central nervous system. These are released into the blood stream and functions as chemical mediators. It is released during stimulus of fight, flight and times of stress.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

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