One way is by releasing it , a second way is by inactiating it once it is released into the synaptic space between the nere endings , and the third way is by absorbing it , a process known as " reuptake " 一種機制是通過排泄,另一種是當它被釋放到神經末梢之間的突觸間隙時滅活,第3種是吸收,這種過程稱為“再攝取” 。