PSYC 1B - QUIZ #1

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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


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