Question

Which of the following structure is not present in the medulla?

• A. Loop of henle
• B. Vasa recta
• C. Juxtaglomerular apparatus
• D. Collecting duct

Answer 1

The correct option is C Juxtaglomerular apparatus

Juxtaglomerular apparatus is a special sensitive region formed in the cortex region of the kidney. It is formed by the cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact. The compact arrangement of the nephrons allows close contact between the afferent arteriole and the distal convoluted tubule. It's function is to regulate blood pressure.
Henle’s loop is a u-shaped tubule and is a part of nephron that lies in the medullary region of nephron.
The efferent arterioles from the glomerulus branches to form the peritubular capillaries. These capillaries further forms the vasa recta around the loop of Henle.
Collecting duct is the last part of a long, twisting tube that collects urine from the nephron and moves it into the ureters. It lies mostly in the medullary region of nephron.