Inhibition of the parasympathetic system can therefore also cause dilation .

抑制副交感神经系统能够导致瞳孔扩张。

They work by paralyzing the parasympathetic nervous system , blocking the nerve endings .

它们能麻痹副交感神经系统，堵塞神经末梢信息传递。

Stimulation of the parasympathetic system , known for " rest and digest " functions , causes constriction .

副交感神经系统受到刺激，触发“休息与消化”（restanddigest）功能，导致瞳孔缩小。

For instance , this 2010 study found that " forest environments promote lower concentrations of cortisol , lower pulse rate , lower blood pressure , greater parasympathetic nerve activity , and lower sympathetic nerve activity than do city environments . "

例如，2010年的这个研究发现“大自然环境比城市环境更有助于降低皮质醇浓度，降低脉搏率，有更高的副交感神经活性，并且降低交感神经活性。”