Question 18

The functional unit of the kidneys is the nephron.

The nephron is the basic structural and functional unit of the kidneys, responsible for filtering blood and forming urine.

A) Loop of Henle

The Loop of Henle is a component of the nephron that plays a crucial role in concentrating urine and conserving water. However, it is not the entire functional unit of the kidney, as it is only one part of the nephron.

B) Ureter

The ureter is a tube that carries urine from the kidneys to the bladder. It does not perform any filtering or urine formation functions and thus is not considered the functional unit of the kidneys.

C) Glomerulus

The glomerulus is a network of capillaries located at the beginning of each nephron that is involved in the filtration of blood. While it is essential for kidney function, it is only one part of the nephron and not the complete functional unit.

D) Nephron

The nephron encompasses all the necessary structures for the filtration of blood and the formation of urine, making it the fundamental functional unit of the kidneys.

Conclusion

The nephron is definitively the correct answer as it integrates all components necessary for kidney function, including filtration, reabsorption, and secretion. The other options, while important in their respective roles, do not represent the complete functional unit of the kidneys.