PSYC 1B - QUIZ #1
A presynaptic terminal is also known as ____.
A presynaptic terminal is also known as ____.
Which scientific work did Cajal apply to his study of infant brains?
Charles Sherrington's study of reflexes
Which scientific work did Cajal apply to his study of infant brains?
Charles Sherrington's study of reflexes.
Glucose enters the brain via which type of transport?
active transport
Which type of glia release chemicals that modify the activity of neighboring neurons?
astrocytes
Korsakoff's syndrome ____.
is marked by severe memory impairments
The endoplasmic reticulum is a ____.
network of thin tubes that transport newly synthesized proteins
Santiago Ramon y Cajal demonstrated that ____.
neurons are separate from one another
What type of glial cells myelinate axons in the brain and spinal cord?
oligodendrocytes
When a neuron's membrane is at rest, the concentration gradient tends to move potassium ____ the cell and the electrical gradient tends to move it ____ the cell.
out of; into
Small, charged molecules can cross the cell membrane through ____.
protein channels
In the normal course of an action potential, ____.
sodium remains much more concentrated outside than inside the neuron
What is one major cause for the resting potential of a neuron's membrane?
the sodium-potassium pump
The all-or-none law states that ____.
a neuron produces an action potential of maximal strength, or none at all
When the neuronal membrane is at rest, the sodium channels ____.
are closed, so there is almost no flow of sodium
As a general rule, axons convey information ____.
away from their own cell body
Under which conditions would the sodium-potassium pump likely be far less effective in creating a concentration gradient?
if selective permeability of the membrane did not exist
The insulating material that covers many vertebrate axons is called the ____.
myelin sheath
Voltage-activated channels are channels for which a change in the voltage across the membrane alters their ____.
permeability
When the neuronal membrane is at rest, the potassium channels ____.
permit potassium ions to pass slowly
