Gated channels may be

A sensory neuron carries stimuli from the central nervous system to the effector.

Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid:

A synapse is

The most abundant class of neuron in the central nervous system is

Communication across a synapse usually involves the release of

Ten-year-old Tina falls while climbing a tree and lands on her back. Her frightened parents take her to the local emergency room where she is examined. Her knee jerk reflex is normal and she exhibits a plantar reflex (negative Babinski reflex). These results suggest that

The withdrawal, or flexor, reflex is one of the only voluntary reflexes.

Which of these glial cells can form a myelin sheath around axon fibers in the central nervous system?

________ centers receive information from many association areas and direct extremely complex motor activities such as speech.