The Single Celled Organisms Protozoa form part of the Kingdom Protista.
Some protozoans are so small that they parasitise the cells of the host they inhabit.
Protozoans may live in all parts of the body, including the gut, the mouth, the skin, the blood, the liver, the spleen, the genital tract, the lungs and the heart. The Amoebae form part of the Phylum Sarcomastigophora, along with the Flagellates . They also use these pseudopods to capture food, surrounding what they are about to eat and eventually engulfing it. Amoebae can live in a number of places around the human body, but most are found in the intestine. The irritation this creates can lead to the condition known as amoebic dysentery.