Brain and Behavior Quiz 1
____ in the brain and spinal cord and ____ in the periphery are specialized types of glia that build the myelin sheaths that surround neurons.
Oligodendrocytes; Schwann cells
The resting potential of a neuron refers to the ____.
net negative charge on the inside of the neuron
The two basic kinds of cells in the nervous system are _____.
neurons and glia
According to the all-or-none law, ____.
once an axon reaches threshold, the amplitude and velocity of an action potential are nearly equal each time
A membrane produces an action potential whenever the potential across it reaches what level?
the threshold of excitation
Which type of glia remove waste material in the nervous system?
astrocytes
Neurons typically have one ____, but many ____.
axon; dendrites
The tree-like branches of a neuron that receive information from other neurons are called _____.
dendrites
The function of a myelin sheath is to ____.
increase the velocity of transmission along an axon
When the potential across a membrane reaches threshold, the sodium channels ____.
open to let sodium enter the cell rapidly