Only for those groups have scientists almost completely identified all the world's species. Biologists have yet to describe many species of plants, invertebrate animals and lichens. So the number of these species known to science increases substantially every year.
The interglandular tissue is also increased in quantity, and is crowded with large round, oval, or polygonal cells, termed decidual cells. Their enlargement is due to glycogen and lipid accumulation in the cytoplasm allowing these cells to provide a rich source of nutrition for the developing embryo.rom Wikipedia, the free encyclopedia. Before the fertilized ovum reaches the uterus, the mucous membrane of the body of the uterus undergoes important changes and is then known as the decidua.
There are two types of cilia, motile cilia (moving cilia) and non-motile cilia. Motile cilia constantly beat in a single direction, whilst non-motile cilia typically sense the cellsâ environment. Non-motile cilia are often referred to as âprimaryâ cilia.ormally a cell only has one non-motile cilium. There are some cells in the body that have a specialized primary cilium which have a very important job to do. For example in the human eye, there is a primary cilium that connects the outer segment of the rod photoreceptor cell to its cell body.