Active transport The transport of molecules or ions across a cell membrane against a concentration gradient, with the expenditure of energy, usually in the form of ATP.
Active transport The transport of molecules or ions across a cell membrane against a concentration gradient, with the expenditure of energy, usually in the form of ATP.
主动运输：伴随着能量的消耗，ATP的产生，逆着浓度梯度的分子或者离子的跨膜运输。