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.
They may contain 86-billion neurons, but that is precisely the number that you would expect to find (based on the scaling rules of primates) for a brain of its size; if you increased a chimpanzee's brain to the size of a human's, you'd find it to have just as many neurons as your own. Advertisement. Advertisement.