1 (d) The Neuron

The mammal brain contains 100 million to 1 billion neuron.  there are 3 main parts of the neuron ( Cell Body , Axon and Dendrites).  The Cell Body integrates signals and it coordinates metabolic activity.  The Axon looks like a long arm extending from the Cell Body.  The Axon transmitters the action potential. The Axon is insulated by a myletian sheath. This forces the action potential to jump from one Node of Ranvier to the other one.  Dendrites extend out of the cell body. Dendrites recive messages from other Neurons.