has primary input serotonin(1+) transport serotonin transport The directed movement of serotonin into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Serotonin (5-hydroxytryptamine) is a monoamine neurotransmitter occurring in the peripheral and central nervous systems. GO:0006837 monoamine transport organic hydroxy compound transport