OSSF:epithelium UPDATED ACTUAL
Exam Questions and CORRECT Answers
what are the 4 basic cell types - CORRECT ANSWER - muscle, nerve, epithelial, connective
characteristics of epithelial cells - CORRECT ANSWER - offer protection, absorption,
secretion
has high mitotic activity-constantly dividing
closely apposed and tightly adherent (cell to cell adhesion molecules)
organized into sheets, tubules or solid organs
avascular
supported by connective tissue
functional and morphological polarity: apical surface, basal surface, lateral surface, basement
membrane (review diagram slide 4)
where are epithelial cells often found - CORRECT ANSWER - body surface such as skin
lining of closed body cavities: blood vessels and lymphatics (endothelial cells)
body cavities (mesothelial cells)
line body tubes
-alimentary tract
-respiratory tract
-GI tract
forms secretory solid organs glands and ducts
What are endothelial cells? - CORRECT ANSWER - Endothelial cells are specialized
epithelial cells that line the inside of blood vessels.
what are mesothelial cells - CORRECT ANSWER - normal lining cells of the abdominal and
thoracic cavities
, where are endothelial cells derived from in embryonic tissue - CORRECT ANSWER -a3
layer: endoderm, mesoderm, ectoderm
where does the cytokeratin in cells derive from embryonically - CORRECT ANSWER -
endoderm and ectoderm
(epithelial cells)
where does the vimentin in cells derive from embryonically - CORRECT ANSWER -
mesoderm
(mesenchymal cells)
why is cell polarity important - CORRECT ANSWER - position of organelles
apical surface characteristics-glycocalyx, microvilli, cilia, stereocilia
cell-cell junctions
cell-basement mem. juncts.
what are specializations of the apical surface - CORRECT ANSWER - microvilli, stereocilia,
cilia-motile and primary(monocilia)
glycocalyx
what is glycocalyx - CORRECT ANSWER - it is a gelatinous glycoprotein that is present on
all cells and covers cell mems. of some epithelial
what does the glycocalyx do - CORRECT ANSWER - cell recognition
cell adhesion
protection
permeability barrier:
-controls access to cell membrane receptors
Exam Questions and CORRECT Answers
what are the 4 basic cell types - CORRECT ANSWER - muscle, nerve, epithelial, connective
characteristics of epithelial cells - CORRECT ANSWER - offer protection, absorption,
secretion
has high mitotic activity-constantly dividing
closely apposed and tightly adherent (cell to cell adhesion molecules)
organized into sheets, tubules or solid organs
avascular
supported by connective tissue
functional and morphological polarity: apical surface, basal surface, lateral surface, basement
membrane (review diagram slide 4)
where are epithelial cells often found - CORRECT ANSWER - body surface such as skin
lining of closed body cavities: blood vessels and lymphatics (endothelial cells)
body cavities (mesothelial cells)
line body tubes
-alimentary tract
-respiratory tract
-GI tract
forms secretory solid organs glands and ducts
What are endothelial cells? - CORRECT ANSWER - Endothelial cells are specialized
epithelial cells that line the inside of blood vessels.
what are mesothelial cells - CORRECT ANSWER - normal lining cells of the abdominal and
thoracic cavities
, where are endothelial cells derived from in embryonic tissue - CORRECT ANSWER -a3
layer: endoderm, mesoderm, ectoderm
where does the cytokeratin in cells derive from embryonically - CORRECT ANSWER -
endoderm and ectoderm
(epithelial cells)
where does the vimentin in cells derive from embryonically - CORRECT ANSWER -
mesoderm
(mesenchymal cells)
why is cell polarity important - CORRECT ANSWER - position of organelles
apical surface characteristics-glycocalyx, microvilli, cilia, stereocilia
cell-cell junctions
cell-basement mem. juncts.
what are specializations of the apical surface - CORRECT ANSWER - microvilli, stereocilia,
cilia-motile and primary(monocilia)
glycocalyx
what is glycocalyx - CORRECT ANSWER - it is a gelatinous glycoprotein that is present on
all cells and covers cell mems. of some epithelial
what does the glycocalyx do - CORRECT ANSWER - cell recognition
cell adhesion
protection
permeability barrier:
-controls access to cell membrane receptors
