| A | B |
|---|
| Two main communication systems | Endocrine and nervous |
| Endocrine system communicates with these | hormones |
| Nervous systems communicates with these | neurotransmitters and electrical stimuli |
| CNS includes these | brain and spinal cord |
| CNS major functions | communication, coordination, receiving center, interpretation, response, intellect and reasoning |
| Structural and functional unit of the nervous system | neuron |
| difference between neuron and otehr cells | has extensions |
| extensions of the neuron | Axon and Dendrite |
| Extension that transmits impulses to cell body | Dendrite |
| Extension that transmits impulses away from the cell body | Axon |
| Responsible for the myelin sheath | neurilemma |
| Fatty substance produced by the myelin sheath | myelin |
| Purpose of myelin | protection |
| This would happen if part of the neuron is not myelinated | short circuit of neurons |
| areas that are not myelinated | gray matter |
| Sensory | afferent - carries impulse from area, up spinal cord, to brain |
| Motor | efferent - carries impulse from bran, down spinal cord, to area that needs something done |
| Associative | mixed, connecting - carries impulse from one neuron to another within the CNS |
| Nerve tract | group of neurons complete with blood supply within CNS containing sensory or motor neurons |
