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 total number of neurons in the brain of a human is around a hundred billion. Inside the motherâs womb, brain cells grow at an astounding rate of 250,000 neurons per minute. The longest axon in the human body extends from the tip of the toe up to the neck. It measures fifteen feet in length.