AP Psychology : Neurons and Action Potentials
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Example Question #51 : Biology
Which of the following is not part of a neuron?
Glia
Axon
Myelin sheath
Dendrite
Cell body
Glia
Glia, also known as glial cells, are non-neuronal cells that provide support and protection for neurons located in the central nervous system. Neurons are made up of dendrites, axons, and a cell body (which is covered by the myelin sheath).
Example Question #931 : Individual Psychology And Behavior
What is a refractory period?
A period when a neuron fires hydrogen and carbon ions into the nearest glial cell.
A period when a neuron requires less stimulation to fire at an intense level.
A period when a neuron is unable to fire due to a lack of internal stimulation.
A period when light is refracted onto the neuron's surface.
A period immediately after a neuronal firing during which no additional neuronal firings can be completed.
A period immediately after a neuronal firing during which no additional neuronal firings can be completed.
The refractory period can be thought of as the recovery time that a neuron needs between action potentials. During this period, no additional neurotransmitters can be fired. Most refractory periods are quite short, lasting less than a single second.
Example Question #53 : Biology
What is the myelin sheath's function?
Absorb beneficial elements from other surrounding neurons
Protect glial cells from foreign particles
Receive neural impulses from axons
Maintain an appropriate level of chlorophyll in the cell
Increase the speed of neural impulses
Increase the speed of neural impulses
The myelin sheath is a layer of fatty tissue that encases the fibers of most neurons. The myelin sheath enables vastly greater transmission speed of neural impulses as the impulse hops from one node to the next.
Example Question #51 : Neurons And Action Potentials
The sodium potassium pump plays an integral role in neuronal transmission by bringing sodium _______________ cell and potassium ________________ the cell.
into . . . out of
out of . . . out of
out of . . . into
None of these
into . . . into
out of . . . into
The sodium potassium pump moves sodium and potassium against their concentration gradient. The pump moves 3 sodium ions out of the cell and 2 potassium ions into the cell. This pump requires ATP (cellular energy) since it is pumping ions against their gradient.
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