Mouth of Tetrahymena pyriformis protozoan. Coloured scanning electron micrograph (SEM) of the buccal cavity (mouth) of a Tetrahymena pyriformis protozoan. Hair-like cilia (blue) are seen covering the body surface of this single-celled animal. The body cilia beat in waves, propelling the animal and enabling it to be mobile. Around the opening of the protozoan's mouth are several more cilia, which are used to waft food particles into it to be digested. Magnification: x3,500 at 6x7cm size. x12,000 at 9.5x7.5ins