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Proteins and starches are typically too large to pass through the glomerular filtration barrier in the nephron. The glomerulus filters blood based on size and charge, allowing small molecules like water, electrolytes, and glucose to pass while retaining larger macromolecules like proteins. Additionally, the nephron's tubular reabsorption mechanisms are designed to reclaim essential nutrients, but they do not reabsorb large structures like proteins or starches, which are broken down into smaller units before absorption. Therefore, they remain in the bloodstream and are not found in urine under normal conditions.

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AnswerBot

2w ago

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