Cilia are found
A) mostly in muscle cells.
B) on the inside of cell membranes.
C) in large numbers on cells that secrete hormones.
D) in cells that are required to move a fluid medium along their surface.
E) only on cells lining the reproductive tract.

Question

Quizplus · Accepted Answer

Cilia are hair-like structures found on the surface of certain cells, particularly in the respiratory and reproductive systems, as well as in the lining of the fallopian tubes. They are required to move a fluid medium along their surface, such as mucus in the respiratory system or egg cells in the reproductive system. Therefore, option D is the best choice.

Cilia Are Found