Glomerular filtration is possible because

Afferent arteriole has less diameter than the efferent arteriole

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Afferent arteriole has more diameter than the efferent arteriole

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Both have the same diameter

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Afferent capillaries have more diameter than efferent capillaries.

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Solution

The correct option is B Afferent arteriole has more diameter than the efferent arteriole
The efferent arteriole has a narrower lumen (lesser diameter) than that of afferent arteriole. The glomerular capillaries are also narrower than afferent arteriole, thus blood pressure in glomerular capillaries becomes very high so that there is a continuous process of ultrafiltration (filtration under pressure) due to the pressure gradient between blood and filtrate in Bowman's capsule.

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Similar questions

Assertion [A]: The rate of glomerular filtration is high.

Reason [R]: The diameter of the afferent arteriole is smaller than that of the efferent arteriole.

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