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Proteins are present in the blood tube but not in the glomerular filtrate. Why does this compositional discrepancy exist?
Blood bibulous pressure is maintained by the presence of tube proteins.
From the order tubule, proteins are laboriously carried back into the blood capillaries.
Proteins can not pass through the membranes of the glomerular capillaries.
There's a high hydrostatic pressure in the blood within the glomerular capillaries.
Answers (1)
The presence of high hydrostatic pressure in the blood within the glomerular capillaries is the main reason why proteins are not present in the glomerular filtrate. The glomerular capillaries have high blood pressure, which helps in the filtration of small molecules and water from the blood into the Bowman's capsule. However, larger molecules like proteins are unable to pass through the filtration membrane due to their size and the presence of negatively charged barriers in the membrane. Therefore, proteins remain in the blood within the glomerular capillaries and do not enter the glomerular filtrate. This results in a compositional discrepancy between the blood and the glomerular filtrate, with proteins being present in the blood but not in the filtrate. Therefore, option 4 is the correct answer.
The explanation for incorrect options,
Option 1 is incorrect because blood colloid pressure (also known as oncotic pressure) is responsible for maintaining fluid balance and preventing excessive fluid loss, but it does not specifically explain the absence of proteins in the glomerular filtrate.
Option 2 is incorrect because proteins are not laboriously carried back into the blood capillaries from the tubules. Reabsorption of proteins does not occur in the renal tubules under normal physiological conditions.
Option 3 is incorrect because proteins are unable to pass through the glomerular capillary membranes, primarily due to their size and charge, rather than the general inability of proteins to pass through any membrane.
Hence, the correct answer is option 4.
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