Final answer:
The vasa recta is important for reabsorption and secretion in the kidneys by maintaining the countercurrent multiplier system.
Step-by-step explanation:
The vasa recta is necessary for reabsorption and secretion to occur in the kidneys.
The vasa recta are a network of capillaries that run parallel to the loop of Henle in the nephrons of the kidneys.
They help maintain the countercurrent multiplier system, which is essential for the reabsorption of water and solutes.
By flowing slowly, the vasa recta allow for the exchange of water and solutes between the kidney medulla and the blood, preserving the osmolar gradient necessary for the recovery of solutes and water.