Final answer:
The DCT still contains 20% of the original water and about 10% of the sodium. Aldosterone enhances sodium reabsorption, indirectly aiding in water recovery.
Step-by-step explanation:
The fluid arriving in the Distal Convoluted Tubule (DCT) still contains approximately 20 percent of the original water and about 10 percent of the sodium. The DCT continues the process of reabsorbing water and solutes. Aldosterone plays a key role here by increasing the amount of Na+/K+ ATPase, promoting the reabsorption of Na+ and facilitating Cl- movement out of the tubular lumen. A significant portion of solutes and water are recovered and returned to circulation through peritubular capillaries, maintaining the osmolarity of blood.