Dictionary > Trophozoite

Trophozoite

Definition
noun, plural: trophozoites
The active, amoeboid cell form that occurs during the feeding stage in the life cycle of an apicomplexann
Supplement
Apicomplexa is a phylum comprised of protozoans characterized by having a special organelle called an apical complex, and most of them are single-celled, parasitic, and spore-forming. They are intracellular parasites. Their life cycle is comprised of stages where each has a particular cellular variety. Nevertheless, not all members have all the various life stages. An example of an apicomplexan with the trophozoite cell type is the Plasmodium species, the causative agent of malaria. Plasmodium species use two hosts (human and Anopheles mosquito) to complete its complex life cycle. In the human host, the sporozoites injected by the mosquito during a blood meal are circulated by the bloodstream. When they reach the liver cells of the human host they transform into trophozoites. The trophozoite is the active, amoeboid cell form of the Plasmodium. It loses its apical complex and surface coat. The tropozoites particularly invade the vacuole of the hepatocyte where they will go through schizogonic development. Their nucleus will undergo multiple divisions while their cell size increases. They develop and differentiate into merozoites.
See also:


You will also like...

Human gastrointestinal tract
Human Biology – Food and Digestion

This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

"Cronopio dentiacutus", a prehistoric mammal (an illustration)
Mammalian Ancestors

Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

Human Reproduction
Human Reproduction

Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

Darwin's Finches - Natural Selection
Darwin and Natural Selection

This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..

Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

Young plant growing from the soil.
Soils

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..