A mixed tideâtwo uneven tides a day, or one high and one lowâis also possible. Tides vary on timescales ranging from hours to years due to a number of factors. To make accurate records, tide gauges at fixed stations measure water level over time.
Top 10 facts about the world. Oligodendrocytes, also known as oligodendroglia, are a type of brain cell in the central nervous system that belongs to the glial cell family. The main purpose of glial cells is maintenance and support of nervous system cells.
Astrocytes. Astrocytes belong to the 3 types of glial cells in the CNS (the others are microglia and oligodendrocytes). Astroglia is used as a synonym. These cell exhibt usually a star-shaped mmorphology, with many processes extending from the soma.ligodendrocytes. Oligodendrocytes are a variety of neuroglia cells within the central nervous system. In comparison to astrocytes oligodendrocytes are more gracile and form less cell ramifications. Their image in a microscopic cross section is reminiscent of trees with only a few branches-hence the name.