GALEN A&P NU-110 EXAM 4 LATEST QUESTIONS WITH COMPLETE SOLUTIONS 2024/2025 VERIFIED GRADED A+
The Central Nervous System (CNS)
Includes the brain and the spinal cord
The Peripheral Nervous System (PNS)
includes the nerves that connect the Central Nervous system with the rest of the body
What...
includes the nerves that connect the Central Nervous system with the rest of the body
What are the 2 parts of nervous tissue
Glia Cells, and neurons.
Glia cell
are support cells of the brain
astrocytes, microglia, oligodendrocytes
Astrocytes
makes the blood brain barrier. Connects to blood vessels and acts as the gate keeper.
Does allot with metabolism, mostly of medication
Microglia
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
secretes allot of myelin. It is important for the neuron. Actually wraps around portions of
the neuron.
Myelin
,increases the speed of the neuron. It is the white matter of the brain and the spinal cord.
Neurons and Glia can grow back
but they grow back very slowly.
In the neuron information only travels
in one direction. That way there is no traffic jams or mixed signals.
Dendrites
where the information comes in to the neuron
Cell Body
houses the nucleus and other cell structures. Receives signal from the dendrites.
Axon
gets information from the cell body
Axon Terminals
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
Myelin
Afferent Neurons
are sensory neurons. Carries information to the Central nervous system.
Interneurons
makes connections within the central nervous system.
Efferent Neurons.
Motor neurons. Carry information away from the Central nervous system and towards
the periphery.
Neurons and glia are all
, intermingled together
ActionPotential or Nerve impulse
is the electrical signal. Can only happen in the neuron
Neuron can only be in one of 3 states
Polarization, Depolarization, Repolarization
Polarization State.
is the resting State. The inside is more negative. Potassium is being moved out. and the
inside of the cell becomes more negative.
Depolarization
Is a stimulated neuron. The inside of the cell becomes more positive. There is allot of
Sodium to come into the cell.
Repolarization
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.
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
are schwann cells and oligodendrocytes.
Schwann cell is located in the
peripheral nervous system. makes myelin
Oligodendrocytes
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