And it's these neurotransmitters that act like couriers diffusing across the synaptic gap, and binding to receptor sites on the postsynaptic neuron.

正是这些神经递质像信使一样在突触间隙扩散，并与突触后神经元上的受体位点结合。

Lipid-soluble hormones, on the other hand, can just basically glide right through that cell membrane, so their receptor sites are inside their target cells.

另一方面，脂溶性荷尔蒙可以直接穿过细胞膜，所以它们的受体位于靶细胞内。

Most of these medications alter the effects of the neurotransmitter dopamine in the brain by blocking its receptor sites, and blocking its uptake.

这些药物中的大多数通过阻断其受体位点并阻止其摄取来改变神经递质多巴胺在大脑中的作用。