NU 110 TEST 4 | QUESTIONS WITH CORRECT ANSWERS 2025/2026

NU 110 TEST 4 | QUESTIONS WITH CORRECT
ANSWERS 2025/2026

The Central Nervous System (CNS) - CORRECT ANSWER -Includes the brain and the spinal cord



The Peripheral Nervous System (PNS) - CORRECT ANSWER -includes the nerves that connect the
Central Nervous system with the rest of the body



What are the 2 parts of nervous tissue - CORRECT ANSWER -Glia Cells, and neurons.



Glia cell - CORRECT ANSWER -are support cells of the brain

astrocytes, microglia, oligodendrocytes



Astrocytes - CORRECT ANSWER -makes the blood brain barrier. Connects to blood vessels and
acts as the gate keeper. Does allot with metabolism, mostly of medication



Microglia - CORRECT ANSWER -immune cells of the brain. Migrate to the area of injury, it covers
it and cleans it up. It does not have allot of T or B cells.



Oligodendrocytes - CORRECT ANSWER -secretes allot of myelin. It is important for the neuron.
Actually wraps around portions of the neuron.



Myelin - CORRECT ANSWER -increases the speed of the neuron. It is the white matter of the
brain and the spinal cord.



Neurons and Glia can grow back - CORRECT ANSWER -but they grow back very slowly.

,In the neuron information only travels - CORRECT ANSWER -in one direction. That way there is
no traffic jams or mixed signals.



Dendrites - CORRECT ANSWER -where the information comes in to the neuron



Cell Body - CORRECT ANSWER -houses the nucleus and other cell structures. Receives signal
from the dendrites.



Axon - CORRECT ANSWER -gets information from the cell body



Axon Terminals - CORRECT ANSWER -Get information from the axon. Is where we release all of
the neuron transmitters.



Not all neurons have ______ but those that do move information quickly - CORRECT ANSWER -
Myelin



Afferent Neurons - CORRECT ANSWER -are sensory neurons. Carries information to the Central
nervous system.



Interneurons - CORRECT ANSWER -makes connections within the central nervous system.



Efferent Neurons. - CORRECT ANSWER -Motor neurons. Carry information away from the
Central nervous system and towards the periphery.



Neurons and glia are all - CORRECT ANSWER -intermingled together



ActionPotential or Nerve impulse - CORRECT ANSWER -is the electrical signal. Can only happen
in the neuron

, Neuron can only be in one of 3 states - CORRECT ANSWER -Polarization, Depolarization,
Repolarization



Polarization State. - CORRECT ANSWER -is the resting State. The inside is more negative.
Potassium is being moved out. and the inside of the cell becomes more negative.



Depolarization - CORRECT ANSWER -Is a stimulated neuron. The inside of the cell becomes more
positive. There is allot of Sodium to come into the cell.



Repolarization - CORRECT ANSWER -returns to resting. Charge goes back to negative inside. Puts
all of the ions back to where they are supposed to be. So potassium moves out. Back to negative
charge on the inside.



Refectory Period. - CORRECT ANSWER -Cell is not able to respond to another action potential
until repolarization is complete and everything is back to where it is supposed to be.



The two cells that make myelin - CORRECT ANSWER -are schwann cells and oligodendrocytes.



Schwann cell is located in the - CORRECT ANSWER -peripheral nervous system. makes myelin



Oligodendrocytes - CORRECT ANSWER -are located in the central nervous system. Makes myelin.



In a myelinated nerve - CORRECT ANSWER -the nerve impulse jumps from node to node.



What is Saltatory Conduction - CORRECT ANSWER -it is the jumping of the nerve impulse in the
myelinated nerve.