3. 2 how the nervous system works: (cell and neurotransmitters) Reaches the end of an axon called axon terminal. Filled with vesicles containing neurotransmitters: the chemicals that function as messengers allowing neuron to communicate with each other. They are released as impulse travel through axon. Sensory neurons: bring bodily senses towards the spinal cord, brain. Motor neurons: sends messages away from brain and toward muscles in order to react to it. Glial cells specialized cells mounting immune responses removing, synchronizing the activity of billions of neurons that constitute the nervous system. Insulate the axon of a neuron resulting in increased speed and efficiency this is a white substance formed by glial cells called myelin protects impulse from decay. When the myelin sheath is damaged, a disease such as multiple sclerosis which allows this to happen as the immune system does not recognize myelin and attacks it. It impairs the ability of the affected neurons to transmit information along their axons.