Answer:
The preferable option for the fill in the blanks will be - D.
D. Juxtamedullary; vasa recta
Explanation:
The juxtamedullary nephrons have LOHs that span deeply into the medulla. The vasa recta are the capillary bed that drains these extended LOHs.
LOH = loop of Henle
- We know that the longitudinal section of the kidney has two regions - 1. an outer dark cortex and 2. inner light medulla.
- The juxtamedullary nephron is the structural and functional unit of the kidney with a long loop of Henle. Juxtamedullary nephrons have a long loop of Henle extending deep into the renal medulla.
- The vasa recta capillaries are long, hairpin-shaped blood vessels that run parallel to the loops of Henle. The hairpin turns slow the rate of blood flow, which helps maintain the osmotic gradient required for water reabsorption.
