Mucous membrane is
found lining the elementary tract, the respiratory tract, and parts of the
genitor-urinary tract. It varies in character in the different areas. In the
digestive tract it consists of columnar epithelial cells closely packed
together. Some of them become distended with mucous secretion and are then
called goblet cells. The cell become more and more distended and finally
ruptures and discharges its secretion on to the surface.
Mucus is the
secretion of the membrane and consists of water, salt and a protein, mucin,
which give the sticky or viscid character to the secretion.
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