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A merozoite (G. meros, part [of a series] + zōon, animal) is the result of merogony that takes place within a host cell. During this stage, the parasite infects the host's cells and then replicates its own nucleus and induces cell segmentation in a form of asexual reproduction.
A trophozoite (G. trope, nourishment + zoon, animal) is the activated, feeding stage in the life cycle of certain protozoa such as malaria-causing Plasmodium falciparum and those of the Giardia group. [1] The complementary form of the trophozoite state is the thick-walled cyst form. They are often different from the cyst stage, which is a ...
Some cell types: ookinete, sporozoite, merozoite. The phylum Apicomplexa contains all eukaryotes with a group of structures and organelles collectively termed the apical complex. [7] This complex consists of structural components and secretory organelles required for invasion of host cells during the parasitic stages of the Apicomplexan life ...
The trophozoite attaches to the olfactory epithelium, follows the axons of olfactory receptor neurons through the cribriform plate in the nasal cavity, and enters the brain. This reproductive stage of the protozoan organism transforms around 25 °C (77 °F), and thrives best at approximately 42 °C (108 °F), multiplying through binary fission .
Trophozoite and merozoite growth ruptures the host erythrocyte, leading to the release of vermicules, the infectious parasitic bodies, which rapidly spread the protozoa throughout the blood. [9] Rather than producing more and more trophozoites, some of the merozoites produce gametocytes .
A trophozoite feeds on the haemoglobin and forms a granular pigment called haemozoin. Unlike those of other Plasmodium species, the gametocytes of P. falciparum are elongated and crescent-shaped, by which they are sometimes identified. A mature gametocyte is 8–12 μm long and 3–6 μm wide. The ookinete is also elongated measuring about 18 ...
The trophozoite is conical in shape. Two types of schizogony occur in this family. In the first type the schizonts divide into merozoites with small nuclei. These are known as mycetoids merozoites. These develop into trophozoites.
Inside the host, the sporulated oocyst opens, and eight sporozoites are released. Each one finds a home in an intestinal cell and starts the process of reproduction. These offspring are called merozoites. When the cell is stuffed full of merozoites, it bursts open, and each merozoite finds its own intestinal cell to continue the cycle. [3]