â¢ The cell cycle is a series of events that takes. place from one cell division to the next. â¢ The time is takes to complete a cell cycle is. not the same in all cells.
A neuron is a nerve cell. The brain is made up of approximately 100 billion neurons. Neurons are similar to other cells in the body in some ways such as: Neurons are surrounded by a membrane. Neurons have a nucleus that contains genes. Neurons contain cytoplasm, mitochondria and other organelles.
Salem Press, 1998: 221.It has been estimated that the adult brain has around one hundred billion neurons and an even larger number of glial cells.100 billionThe Science Times Book of the brain. New York: The Lyons Press, 1987: 150.The human brain holds about 100 billion nerve cells.100 billionThe Scientific American Book of the Brain.