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first off you need to know that glomerular filtrate is plasma that has entered Bowman's capsule. Now the reason why red blood cells are normally absent from the glomerural filtrate is because they are to big to pass into the Bowman's capsule.

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Red blood cells are absent from the glomerular filtrate because they are too large to pass through the filtration membrane in the kidneys, which only allows small molecules like water, ions, and waste products to pass through. The presence of red blood cells in the filtrate could indicate damage to the filtration membrane.

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Q: Why are red blood cells absent from the glomerular filtrate?
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What should not be found in the glomerular filtrate?

Large proteins (such as albumin), blood cells, and platelets should not be found in the glomerular filtrate during the process of kidney filtration. These substances are too large to pass through the filtration barrier and should be retained in the bloodstream.


Why is there no protein in the glomerular filtrate or unine?

Protein is typically absent in glomerular filtrate and urine due to the selective permeability of the glomerular filtration barrier, which consists of endothelial cells, a basement membrane, and podocytes. These structures prevent large molecules like proteins from passing through while allowing smaller molecules and water to filter through. Additionally, any small amounts of protein that may enter the filtrate are usually reabsorbed by renal tubules before urine formation. Therefore, healthy kidneys maintain minimal to no protein levels in urine.


What is a major urine formation process?

A major urine formation process is glomerular filtration, where blood is filtered in the kidneys' glomeruli. During this process, water, ions, and small molecules pass from the blood into the Bowman’s capsule, forming a filtrate while larger molecules like proteins and blood cells remain in the bloodstream. This initial filtrate is then modified through tubular reabsorption and secretion, ultimately leading to the production of urine.


How does filtrate differ from blood?

Filtrate is the liquid that has passed through a filter, such as in the initial stages of kidney filtration where blood components are filtered into the renal tubule. Filtrate contains water, ions, glucose, and other small molecules that are filtered out of the blood. Blood, on the other hand, contains all components of the circulatory system including red blood cells, white blood cells, platelets, and plasma proteins.


Why does filtrate in the glomerulus have a low protein concentration?

Filtrate in the glomerulus has a low protein concentration because the glomerular capillaries are relatively impermeable to large molecules like proteins due to the presence of podocyte cells and intricate filtration barriers. These barriers prevent proteins from entering the filtrate and ensure that essential proteins remain in the bloodstream.