Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

We should support each other to overcome difficult times.

The cell membrane plays an important role in maintaining the structure of the cell.

The amnion plays an important role in protecting the fetus.

The ophthalmologist diagnosed me with uveitis.

Cats close their nictitating membrane when they are surprised.

The serous membrane covers many organs in the body.

The cere of this bird is very brightly colored.

The hymen is a part of the female reproductive system and can break under certain circumstances.