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.
A typical calculation goes something like this: There are about 100 billion neurons in the human brain. On average each sends outgoing connections to roughly 10,000 other neurons. Calculating the capacity of these connections, or synapses, is assumed to give a sense of the brainâs total capacity.