Question

When glomerular filtration is working correctly, which of the following does not enter the nephron: glucose, red blood cells, or sodium?

Answer 1

When glomerular filtration is working correctly the red blood cells do not enter the nephron.

Explanation:

The factors determining the permeability and selectivity of the glomerulus are :

A) presence of negative charge of the basement membrane and the podocytic epithelium.
B) effectively small pore size of the glomerular wall.

As a result, small or positively charged molecules will pass through freely. For example small ions like sodium and potassium pass freely but RBC's , large proteins like albumin and haemoglobin have practically no permeability at all.