Question

Which one is the diluting segments of the uriniferous tubule?

Answer 1

Hint: Nephron or also called as the uriniferous tubule is the excretory unit in the kidney. The process of removing toxic waste from the body of an organism is called excretion. The formation of urine is carried out by the nephron and is known as the primary unit of homeostasis. The main functions of the nephron are filtration of blood, reabsorption and also secretion.

Complete answer:
Henle’s loop has a descending and an ascending limb. The descending limb is permeable to water but it is impermeable to an electrolyte, whereas the ascending limb is permeable to electrolytes but is impermeable to water. Since the electrolytes get reabsorbed in the ascending loop of Henle, the filtrate gets diluted because it moves towards the ascending limb.

The cells of the ascending limb actively reabsorb the solutes from the luminal fluid and are impermeable to water. As the ions leave the lumen, the concentration becomes more and more hypotonic till it reaches approximately \[100 - 150{\text{ }}mOsm/L\]. The ascending limb is also called the diluting segment of the uriniferous tubule or the nephron because of its ability to dilute the fluid in the loop from \[100 - 150{\text{ }}mOsm/L\] .

Therefore, the diluting segments of the uriniferous tubule is 'Ascending loop of Henle'.

Note: Reabsorption is limited in the ascending loop of Henle. The kidneys are situated in the retroperitoneal space in the abdominal cavity, below the rib cage and are present in the opposite direction or facing each other on both the left as well as the right side of the body. The right kidney is slightly smaller and also lower than the left kidney.