Final answer:
The cell model for K+ transport in the distal convoluted tubule (DCT) involves the movement of ions against their concentration gradient. DCT cells have fewer microvilli compared to the PCT, but they still pump ions using mitochondria. Transport of K+ in the DCT is facilitated by the Na+/K+ ATPase on the basal membrane.
Step-by-step explanation:
The cell model for K+ transport in the distal convoluted tubule (DCT) involves the movement of ions against their concentration gradient. The DCT cells have fewer microvilli on the apical surface compared to the proximal convoluted tubule (PCT), but they still pump ions using large numbers of mitochondria. The transport of K+ in the DCT is facilitated by the Na+/K+ ATPase on the basal membrane, which creates an electrochemical gradient, allowing for reabsorption of K+ into the lumen through leaky channels on the apical membrane.