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.
Report Abuse. A, B Schwann cells supply the myelin in the PNS oligodendrocytes supply it in the CNS Microglia are the macrophages of the CNS astrocytes-regulate the chemical environment of neurons by removing XS ions.Source(s): neurobiology class.PBullyLuv Â· 9 years ago. Thumbs up.eport Abuse. A, B Schwann cells supply the myelin in the PNS oligodendrocytes supply it in the CNS Microglia are the macrophages of the CNS astrocytes-regulate the chemical environment of neurons by removing XS ions. Source(s): neurobiology class. PBullyLuv Â· 9 years ago.