Which capillary network surrounds juxtaglomerular nephrons?

The correct answer identifies the vasa recta as the capillary network that surrounds juxtaglomerular nephrons. Juxtaglomerular nephrons are specialized in that they are located closer to the medullary region of the kidney, and the vasa recta play a crucial role in maintaining the concentration gradient necessary for the kidney's ability to concentrate urine.

The vasa recta are straight capillaries that descend into the medulla and have a unique function in exchanging nutrients and waste products without disrupting the osmotic gradient established in the renal medulla. They help supply blood to the nephron while ensuring that the concentration of solutes is maintained in the surrounding interstitial fluid, which is vital for the nephron's role in urine production.

In contrast, the peritubular capillary network primarily surrounds the cortical nephrons, and glomerular capillaries are involved in the filtration process taking place at the renal corpuscle. Peritoneal capillaries are associated with the peritoneal cavity and are unrelated to kidney function. Therefore, the involvement of the vasa recta specifically with juxtaglomerular nephrons highlights their integrative role in renal physiology, particularly in the regulation of water