Identify TRUE or FALSE 1. The cells that conduct messages towards the brain are the interneurons. 2. Nerves impulses always travel to the brain through nerve fibers. 3. The presence of myelin gives a nerve fiber its white color and increased rate of impulse transmission. 4. Saltatory conduction involves Schwann cells and occurs at greater speed than on unmyelinated fibers.

Identify TRUE or FALSE

1. The cells that conduct messages towards the brain are the interneurons.
2. Nerves impulses always travel to the brain through nerve fibers.
3. The presence of myelin gives a nerve fiber its white color and increased rate of impulse
transmission.
4. Saltatory conduction involves Schwann cells and occurs at greater speed than on
unmyelinated fibers.
5. The neuron cannot be stimulated during the absolute refractory period.
6. The speed of a nerve impulse is independent of the presence of myelin.
7. The tightly packed coil of neurolemmocyte membrane that encircles certain kinds of
axons is called a node.
8. Depolarization of the membrane of a nerve cell occurs by the rapid influx of organic
ions.
9. In a resting neuron the outside is negatively charged.
10. The interior surface of a membrane of a nonconducting neuron differs from the exterior
surface in that the former is negatively charged and contains more sodium.