Capillaries present around the Loop of Henle are

Explanation

The correct answer is vasa recta. The vasa recta are specialized capillaries that run parallel to the Loop of Henle. They play a crucial role in the counter-current exchange mechanism, which is essential for the kidney's ability to concentrate urine. The other options are not correct: Afferent arterioles supply blood to the glomerulus, efferent arterioles carry blood away from the glomerulus but do not directly loop around the Loop of Henle; instead, they lead to the formation of the vasa recta, and the glomerulus is a separate capillary network involved in filtration, not directly surrounding the Loop of Henle.