Epithelial Tissue Flashcards
Epithelial tissue
Cover organs, form glands
Protect, secrete and absorb
Subdivided into
Covering/linging
Glandular
Covering/lining epithelial
Defining boundaries
Glandular epithelial
Unicellular, complex invaginations
Functions of epithelial
Secretion e.g. gut secretes mucus
Filtration e.g. glomerulus
Protection e.g. skin
Absorption e.g. gut and intestines
Sensation (embedded sensory endings)
Epithelial structural classification
Simple
Stratified
How many and what simple epithelial types
3
Squamous
Cuboidal
Columnar
Simple epithelial basics
One layer of cells
Basement membrane
Different shape nuclei
Basal & apical specialisation
No blood vessels
Squamous epithelial (simple) description
Single layer of flattened cells
Disc-shaped central nuclei
Sparse cytoplasm
Simplest of the epithelia
Squamous epithelium (simple) function
Filtration
Secretes lubricating substances in serosae
Squamous epithelium (simple) location
Kidney glomeruli (filtration)
Alveoli (gas exchange)
Lining of the heart (endocardia lining)
Blood vessels (endothelium)
Lymphatic vessels
Cuboidal epithelium (simple) description
Cube-like cells
Large, spherical central nucleus
Cuboidal epithelium (simple) function
Secretion
Absorption
Cuboidal epithelium (simple) location
Kidney tubules
Small glands (ducts and secretory portions)
Ovary surface
Columnar epithelium (simple) description
Tall cells
Round to oval nuclei
Cilia or microvilli
May contain goblet cells
