Biological Membranes and transport part II Passive transport: with the gradient Water transport--aquaporins Glucose transporters Co-transport of chloride and bicarbonate Active transport: against the gradient Transport ATPases Ion channelsBiological Membranes and Transport part II • Passive transport: with the gradient – Water transport—aquaporins – Glucose transporters – Co-transport of chloride and bicarbonate • Active transport: against the gradient – Transport ATPases – Ion channels