trophozoíte

A trophozoite is the active, feeding stage of certain protozoa and other single-celled organisms. It is the phase where the organism grows and metabolizes, as opposed to a dormant or reproductive stage like a cyst or spore. The term trophozoite comes from the Greek words "trophē" meaning food and "zoon" meaning animal. During this stage, the organism absorbs nutrients from its environment. Trophozoites are typically motile and capable of independent movement, allowing them to seek out food sources. Many parasitic protozoa, such as those causing malaria (Plasmodium species) or amoebic dysentery (Entamoeba histolytica), exist as trophozoites within their host's tissues or blood. The morphology of a trophozoite can vary significantly between species, often featuring a nucleus and cytoplasm containing various organelles. The successful identification and understanding of the trophozoite stage are crucial in diagnosing and treating parasitic infections, as this is often when the organism causes damage to the host.