Microvilli are the finger like projections present on the outer
surface of the cell. Their function is to increase the surface area
of the cells through which the diffusion of materials both into and
out of the cell occur. They are also involved in absorption,
secretion and cellular adhesion.
Since the function of the microvilli is to increase the cell's
surface area, it can only exist in the animal cell and not plant
cell because the plant cell has a cell wall and is therefore rigid
and unable to expand in size.
The advantages of having organelles in cells is that they
contribute in their own way to cell function. Each organelle helps
the cell function as a whole. Some organelles carry out functions
that aren't required by cells, such as chloroplasts and
Microvilli are microscopic cellular membrane protrusions that
increase the surface area of cells and are involved in a wide
variety of functions, including absorption, secretion, cellular
adhesion, and mechanotransduction.