Parasympathetic : Your eyes are very sensitive and responsive to various internal and external environmental factors including ambient light levels and autonomic nervous system stimulation. When you get nervous you can deplete your adrenaline levels or you can also reduce ph within your system which can have the effect of increasing parasympathetic nervous system (pns) tone. The pns stimulates tear formation.
Answered 8/30/2015
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Watery eyes: Agree with dr. Rothman. Same occurs with other emotions such as laughter.
Answered 3/14/2019
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