1. The _____________ are the most abundant neuroglia that connect capillaries to nerves.
 2. The _____ nervous system controls voluntary functions.
 3. The __________ nervous system is composed of sympathetic and parasympathetic nerves.
 4. The most common type of neuron, structurally, is the _______________.
 5. ______________ is another name for a nerve impulse.
 6. All of the nerves outside of the CNS comprise the _____ nervous system.
 7. _____________ neurons, which are rare in adults, are found in the eye and nose.
 8. _________________ neurons carry signals from the CNS to the PNS.
 9. ___________ are supporting cells in the CNS that form myelin sheaths around neurons.
 10. _____________ neurotransmitters stop movement of an impulse.
 11. _____________ is the neurotransmitter that's released into the muscles to activate them.
 12. Neurotransmitters diffuse across the ___________ when passing from neuron to neuron.
 13. In the body, electrical charges are provided by _____________.
 14. As the diameter of a nerve gets larger, the nerve impulse moves ____________.
 15. The _____ nervous system controls the involuntary "fight or flight" response.
 16. A _________________ must be reached before the action potential is generated.
 17. The resting period after an impulse is created is called the ______________.
 18. _____________ synapses allow ions to flow directly from one neuron to another.
 19. The brain and spinal cord comprise the ___________ nervous system.
 20. Norepinephrine is an example of a/an ____________________ neurotransmitter.
 21. A resting neuron has an internal potential of about ___________.
 22. ______________ is when the inner membrane of a neuron becomes less negative.
 23. Neurons are ___________,  which means they can't reproduce.
 24. The myelin on nerve fibers in the PNS is produced by _______________.
 25. The decision-making neurons in the CNS are mainly _____________ neurons.