Answer:
The correct answer is C. The vasa recta is a specialized portion of the efferent arteriole.
Explanation:
In anatomy, the vasa recta or descending straight vessel is an artery of the renal tissue, originated from the efferent arterioles, arched artery, and interlobar artery. They are so named because they follow a straight and descending trajectory from the cortex to the deepest portions of the renal medulla.
Its ramifications are important in order to concentrate the urine. Through a countercurrent system, oxygen and nutrients can be transported to the medulla. This countercurrent system also contributes to maintaining the osmolarity gradient between bark and medulla in the kidney.
