Which Process in the Nephron is Least Selective

Question

Which process in the nephron is least selective?
A) filtration
B) reabsorption
C) active transport
D) secretion
E) salt pumping by the loop of Henle

Accepted Answer

Filtration is the process where blood is filtered through the glomerular capillaries into the Bowman's capsule. It is the least selective process as it allows for the passage of small molecules such as water, ions, and urea, but also larger molecules such as proteins. Reabsorption, active transport, and secretion are all more selective processes, as they involve the movement of specific molecules across the renal tubules. Salt pumping by the loop of Henle is also a selective process as it helps in the reabsorption of specific ions.