Low Selectivity of Solute Movement in the Nephron is a Characteristic

Question

Low selectivity of solute movement in the nephron is a characteristic of
A)salt pumping to control osmolarity.
B)H⁺ pumping to control pH.
C)reabsorption mechanisms along the proximal tubule.
D)filtration from the glomerular capillaries.
E)secretion along the distal tubule.

Accepted Answer

Filtration from the glomerular capillaries is a non-selective process where water and small solutes including ions, glucose, and amino acids are all filtered into the nephron. However, larger proteins and other macromolecules are not filtered. Therefore, low selectivity of solute movement is a characteristic of filtration. Choice A refers to active transport, which is selective. Choices B and E refer to ion pumps, which are also selective. Choice C refers to reabsorption mechanisms, which are highly selective.