The part of the nervous system that is known as the "fight or flight" system because it arouses the body to meet emergencies and respond to emotional events is the branch.

The answer is sympathetic. It is one of two components of the autonomic nervous system; the other being parasympathetic. The other function of the sympathetic system is to maintain body homeostasis. Acetylcholine is the main neurotransmitter in the preganglionic sympathetic neurons while noradrenaline (norepinephrine) is the main neurotransmitter in the postganglionic sympathetic neurons.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

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