Your brain, spinal cord, and nerves are ... brain manage vital functions, such as breathing, heart rate, blood pressure, and food digestion. This system is divided into two parts that balance ...

Each nerve cell, or neuron, has three parts: a cell body, which contains a nucleus, mitochondria and other organelles ...

These ensure that the organism functions as a whole ... The nerve cell is extended, so that nerves can run to and from different parts of the body to the central nervous system.