Final answer:
The filtration membrane in the glomerulus limits the size of molecules entering the capsular space through podocyte processes and capillary endothelial cells.
Explanation:
The size of the molecules entering the capsular space is limited by the filtration membrane in the glomerulus. The filtration membrane restricts the passage of large molecules such as red and white blood cells, platelets, and medium-to-large proteins,
through the podocyte processes and fenestrations of the capillary endothelial cells.
This results in differences in osmotic pressures between the glomerular capillary and Bowman's capsule, driving filtration based on hydrostatic pressure.
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