Answer :
Final answer:
The epithelium is 'avascular but innervated' meaning it lacks blood vessels yet has a nerve supply. It is also characterized by its high cellularity, and a polarized distribution of organelles.
Explanation:
The term 'avascular but innervated' in context of the epithelium refers to one of the special characteristics of epithelial tissues. Avascular means that these tissues lack blood vessels, and no blood vessels cross the basement membrane to enter the tissue. All nutrients must come through diffusion or absorption from underlying tissues or the surface.
Conversely, 'innervated' signifies that these tissues have nerve supply. Despite being avascular, they are innervated, allowing them to perform their functions efficiently.
Epithelial tissues are also known for their high cellularity, with little or no extracellular material present between cells. They have a polarized distribution of organelles and membrane-bound proteins between apical and basal surfaces, and their cell layers form distinct arrangements like squamous, cuboidal, or columnar epithelia.
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