Answer :

B. plus (+) end growth of microfilaments at the tip of the microvillus but no shrinkage at the minus (−) end

Microvilli (plural: microvillus) are tiny cellular membrane protrusions that play a number of roles, including absorption, secretion, cellular adhesion, and Mechan transduction. They improve the surface area for diffusion and limit any increase in volume.

In the digestive system, microvilli serve as the main surface for nutrition absorption. The microvillar membrane is jam-packed with enzymes because of its crucial role, which helps break down complex nutrients into simpler chemicals that are more easily absorbed. For instance, the surface of enterocyte microvilli has significant amounts of glycosidases, enzymes that break down carbs.

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