| A | B |
|---|
| regulates all internal body organs and functions | autonomic nercous system |
| slows down all body activity | parasympathetic nervous system |
| speeds up all body activity | sympathetic nervous system |
| basic unit is a Nerve Cell and a... | Neuron |
| ...with a nucleus - receives impulses | cell body |
| tree shaped branches that bring impulses into the nerve | dendrite |
| cylindrical area whcih carries impulses away from teh nerve | axon |
| outer layer is called... | neurilemma sheath |
| inner layer is called... | myelin sheath |
| dedrites and axons of a neuron are called... | nerve fibers |
| _______ is a bundle of these long fibers that pass on impulses | nerve |
| place where 2 neurons come together | synapse |
| the nerve fiber will not transmit an impulse unless the stimulus applied of a certain minimum strength called a _____________ | thereshold |
| a non-stimulated nerve fiber is... | on the outside and on the inside |
