Which of the following define net filtration pressure $(N F P)$ ?

B C O P - (G H P + C H P)

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G H P - (B C O P + C H P)

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(B C O P + G H P) - C H P

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(G H D - C H P) + B C O P

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Solution

The correct option is B $G H P - (B C O P + C H P)$
Glomerular hydrostatic pressure (GHP) is the pressure created due to narrow efferent arteriole. So GHP - (BCOP + CHP). Here, GHP means the blood pressure in the glomerulus, blood colloidal osmotic pressure (BCOP) is exerted by plasma proteins in the glomeruli. The plasma proteins are not filtered through the glomerular capillaries. This pressure opposes filtration. Capsular hydrostatic pressure (CHP) is the pressure exerted against the filtration membrane by the filtrate in the Bowman’s capsule during filtration. This pressure also opposes filtration. Thus the correct answer is option B.

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