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.
The brain is made up of more than just nerve cells (neurons). Although there are about 100 billion neurons in the brain, there may be about 10 to 50 times that many glial cells in the brain. Neurons CAN generate action potentials...glial cells CANNOT. 2  However, glial cells do have a resting potential. 3  Neurons HAVE synapses that use neurotransmitters...glial cells do NOT have chemical synapses. 4  There are many MORE (10-50 times more) glial cells in the brain compared to the number of neurons.