Question 5

Nephrons are the functional units of the kidney.

Nephrons play a crucial role in filtering blood and forming urine, making them the primary functional units of the kidney.

A) Ureters

Ureters are tubes that transport urine from the kidneys to the bladder, but they do not perform any filtering or functional activities related to kidney function. Therefore, they are not considered the functional units of the kidney.

B) Glomeruli

While glomeruli are important components of nephrons that facilitate the filtration of blood, they are not standalone functional units. Instead, they are part of the nephron structure, which collectively operates to regulate water, electrolytes, and waste excretion.

C) Nephrons

Nephrons are indeed the functional units of the kidney, as they are responsible for filtering blood, reabsorbing essential substances, and excreting waste products in the form of urine. Each kidney contains approximately one million nephrons, highlighting their critical role in renal function.

D) Renal capsules

Renal capsules are protective layers surrounding the kidneys, but they do not engage in any functional processes related to filtration or urine formation. Thus, they cannot be classified as functional units of the kidney.

Conclusion

Nephrons are definitively the functional units of the kidney due to their essential role in filtration and urine formation. The other options, including ureters, glomeruli, and renal capsules, either serve supportive roles or are part of the nephron structure but do not function independently as the kidney’s primary filtering units.