Galen A&P NU-110 Exam 4 Questions
and Answers
The Central Nervous System (CNS) - Answer-Includes the brain and the spinal cord
The Peripheral Nervous System (PNS) - Answer-includes the nerves that connect the Central Nervous
system with the rest of the body
2 parts of nervous tissue - Answer-Glia Cells, and neurons.
Glia cell - Answer-are support cells of the brain
astrocytes, microglia, oligodendrocytes
Astrocytes - Answer-makes the blood brain barrier. Connects to blood vessels and acts as the gate
keeper. Does allot with metabolism, mostly of medication
Microglia - 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 - Answer-secretes allot of myelin. It is important for the neuron. Actually wraps
around portions of the neuron.
Myelin - 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 - Answer-but they grow back very slowly.
neuron information only travels - Answer-in one direction. That way there is no traffic jams or mixed
signals.
Dendrites - Answer-where the information comes in to the neuron
Cell Body - Answer-houses the nucleus and other cell structures. Receives signal from the dendrites.
Axon - Answer-gets information from the cell body
Axon Terminals - Answer-Get information from the axon. Is where we release all of the neuron
transmitters.
Myelin - Answer-Not all neurons have ______ but those that do move information quickly
Afferent Neurons - Answer-are sensory neurons. Carries information to the Central nervous system.
Interneurons - Answer-makes connections within the central nervous system.
, Efferent Neurons. - Answer-Motor neurons. Carry information away from the Central nervous system
and towards the periphery.
Neurons and Glia are all - Answer-intermingled together
Action Potential or Nerve impulse - Answer-is the electrical signal. Can only happen in the neuron
Neuron can only be in one of 3 states - Answer-Polarization, Depolarization, Repolarization
Polarization State. - 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 - Answer-Is a stimulated neuron. The inside of the cell becomes more positive. There is
allot of Sodium to come into the cell.
Repolarization - 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. - 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.
Make myelin (2 cells) - Answer-are schwann cells and oligodendrocytes.
Schwann cell is located in the - Answer-peripheral nervous system. makes myelin
In a myelinated nerve - Answer-the nerve impulse jumps from node to node.
and Answers
The Central Nervous System (CNS) - Answer-Includes the brain and the spinal cord
The Peripheral Nervous System (PNS) - Answer-includes the nerves that connect the Central Nervous
system with the rest of the body
2 parts of nervous tissue - Answer-Glia Cells, and neurons.
Glia cell - Answer-are support cells of the brain
astrocytes, microglia, oligodendrocytes
Astrocytes - Answer-makes the blood brain barrier. Connects to blood vessels and acts as the gate
keeper. Does allot with metabolism, mostly of medication
Microglia - 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 - Answer-secretes allot of myelin. It is important for the neuron. Actually wraps
around portions of the neuron.
Myelin - 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 - Answer-but they grow back very slowly.
neuron information only travels - Answer-in one direction. That way there is no traffic jams or mixed
signals.
Dendrites - Answer-where the information comes in to the neuron
Cell Body - Answer-houses the nucleus and other cell structures. Receives signal from the dendrites.
Axon - Answer-gets information from the cell body
Axon Terminals - Answer-Get information from the axon. Is where we release all of the neuron
transmitters.
Myelin - Answer-Not all neurons have ______ but those that do move information quickly
Afferent Neurons - Answer-are sensory neurons. Carries information to the Central nervous system.
Interneurons - Answer-makes connections within the central nervous system.
, Efferent Neurons. - Answer-Motor neurons. Carry information away from the Central nervous system
and towards the periphery.
Neurons and Glia are all - Answer-intermingled together
Action Potential or Nerve impulse - Answer-is the electrical signal. Can only happen in the neuron
Neuron can only be in one of 3 states - Answer-Polarization, Depolarization, Repolarization
Polarization State. - 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 - Answer-Is a stimulated neuron. The inside of the cell becomes more positive. There is
allot of Sodium to come into the cell.
Repolarization - 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. - 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.
Make myelin (2 cells) - Answer-are schwann cells and oligodendrocytes.
Schwann cell is located in the - Answer-peripheral nervous system. makes myelin
In a myelinated nerve - Answer-the nerve impulse jumps from node to node.
