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.
New York: Scientific American, 1999: 3. | An adult human brain has more than 100 billion neurons | > 100 billion Please note that the answer listed here - over 400,094,800 - refers to the number of cells in the human brain.