The structure of the Paramecium is rather complicated. Its plasma membrane is specially equipped with thickenings, so the membrane can be strengthened. Then, this membrane is called the pellicle. A paramecium has one big nucleus and two smaller nuclei. The bigger nucleus is about nutrition, and the smaller nuclei are for reproduction. There is a definite location on the pellicle for the input of food. It is called the mouth. Inside the mouth is a canal called the cytopharynx. The cilia around the cytopharynx are longer. When there is food, these cilia swipt to form a swirl of water, then, the food particle can be carried into the cytopharynx. At the end of the cytopharynx, food vacuole can be formed. This is the ingestion method of paramecium. The food vacuole would travel along a definite route in cytoplasm. At the end of the journey, the vacuole would endock at a definite point on its pellicle and decantes the waste from the vacuole. This point is called the cytoproct. I have found this information from a site,don't know whether it is reliable.Just for confirmation and verification Are all these correct?