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,Feedback Systems
, Epithelial Tissue
Epithelial tissue consists of a sheet of closely adhering cells, one or more cells
thick, with the upper surface usually exposed to the environment or to an
internal space in the body. Epithelium covers the body surface, lines body
cavities, forms the external and internal linings of many organs, and
constitutes most gland tissue.
Epithelia are avascular
(without blood vessels)
—there is no room for
them bet ween the cells.
Epithelia, however,
usually lie on a vessel-
rich layer of connecti ve
tissue, which furnishes
them with nutrients
and waste removal
Epithelial cells establish an apical-basial polarity which
results from the differential distribution of phospholipids,
proteins complexes, and cytoskeletal components bet ween
the various plasma membrane domains reflecting their
specialized functions
udy u e
u
oi
,Feedback Systems
, Epithelial Tissue
Epithelial tissue consists of a sheet of closely adhering cells, one or more cells
thick, with the upper surface usually exposed to the environment or to an
internal space in the body. Epithelium covers the body surface, lines body
cavities, forms the external and internal linings of many organs, and
constitutes most gland tissue.
Epithelia are avascular
(without blood vessels)
—there is no room for
them bet ween the cells.
Epithelia, however,
usually lie on a vessel-
rich layer of connecti ve
tissue, which furnishes
them with nutrients
and waste removal
Epithelial cells establish an apical-basial polarity which
results from the differential distribution of phospholipids,
proteins complexes, and cytoskeletal components bet ween
the various plasma membrane domains reflecting their
specialized functions
