Active Secretion of NaCl
Chloride cells in marine teleosts
Na-K ATPase on the basolateral membrane pumps Na' into the blood to create a large"EC gradient
K- recycled at the basolateral membrane
Na/2Cl/K- co-transporter on the basolateral membrane
Cl diffuses out the apical side via channels
Na diffuses down its EC gradient(but against an osmotic gradient) through paracellular routes to the apical side