Extensions of the cell surface

cilla

"Antenna" for monitoring nearby conditions Helps with balance in inner ear; light detection in renta.

Pseudopods

"false feet" Continually changing extensions of the cell that vary in shape and size

Microvilli

(1 to 2µm ) brush boarder Gives 15 to 40x more surface area

Microvilli

Best developed in cells specialized in absorption. some contain actin (a bundle of stiff filaments of a protein) filaments that are tugged toward the center of the cell to milk absorbed contents into cell

Pseudopods

Can be used for cellular locomotion, capturing foreign particles.

Motile cilla

Respiratory tract, uterine tubes, ventricles of brain, and ducts of testes. 50 to 200 on each cell beat in waves sweeping material across a surface in one direction

Flagella

Tails of sperm-only functional one in humans. Movement is undulating-snake like-corkscrew

Multiple nonmotile cilia

found on sensory cells of nose

Cilla

hair like processes 7 to 10 µm long

flagella

whip like structure Much longer than cilium Stiffened by coarse fibers that support the tail