Answer:
There are <em><u>four types of neuroglia</u></em> found within the central nervous system:
<u>Astrocytes</u> :
It maintains the blood brain barrier and preserve the chemical environment by recycling ions and neurotransmitters.
<u>Oligodendrocytes</u> :
The myelinate axons in the central nervous system and provide an overall structural framework.
<u>Ependymal cells</u> :
The line ventricles (brain) and central canal (spine) and are involved in the production of cerebrospinal fluid.
<u>Microglia</u> :
It removes cell debris, wastes and pathogens via phagocytosis.
The answer is Digestive system :)
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