NEET · BiologyMedium
If the diameter of the afferent arteriole is significantly reduced while the efferent arteriole remains unchanged, what will be the immediate effect on the glomerular filtration rate?
- A.It will increase due to higher hydrostatic pressure
- B.It will remain constant due to autoregulation
- C.It will decrease due to reduced glomerular hydrostatic pressure
- D.It will decrease due to increased plasma oncotic pressure
Show correct answer & step-by-step solution
Correct answer: C — It will decrease due to reduced glomerular hydrostatic pressure
Solution
- Glomerular filtration rate depends directly on the glomerular hydrostatic pressure.
- The afferent arteriole supplies blood to the glomerulus.
- Reducing the diameter of the afferent arteriole decreases the volume of blood entering the glomerulus.
- This leads to a drop in glomerular hydrostatic pressure, thereby decreasing the filtration rate.
- Hence the answer is (C).
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