1. Neurons that convey information to the CNS are called sensory, or _______________, neurons.

2. To perform their role, neurons must have the properties of excitability, _______________ , and secretion.

3. The _______________ is a period of time in which a neuron is producing an action potential and cannot be reexcited by a stimulus of any strength.

4. The processes of a neuron specialized to receive incoming signals are called _______________ .

5. Myelin is produced by _______________ cells.

6. In a myelinated nerve fiber, action potentials are produced only at regions called _______________ .

7. The trigger zone of a neuron consists of its _______________ and _______________ .

8. Neurotransmitters that work through second-messenger systems are said to have _______________ effects.

9. A presynaptic nerve fiber cannot cause other neurons in its _______________ to fire, but it can cause them to be more sensitive to input from other presynaptic neurons.

10. _______________ are substances that may be released along with a neurotransmitter and modify the effects of the neurotransmitter on a postsynaptic cell.

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