Epithelium and Glands Flashcards
Function of epithelia (5)
- selective diffusion
- absorption
- secretion
- physical protection
- containment
Design of epithelium (3)
- Surface epithelia form continuous sheets (one or more layers)
- cells are closely bound to each other via cell junctions
- epithelia are supported by basement membrane
Function of basement membrane
separate epithelia from underlying supporting tissues
never penetrated by blood vessels (rely on diffusion)
Classification of epithelium
- number of cell layers (simple vs stratified)
- shape of component cells (squamous, cuboidal, columnar)
- presence of surface specializations
8 Types of Glands
Simple Tubular Glands Simple Coiled Tubular Gland Simple Branched Acinar Gland Simple Branched Tubular Gland Simple Acinar Gland Compound Tubular Gland Compound Acinar Gland Compound Tubulo-acinar Gland
simple vs compound glands
simple - ducts do not branch
compound - ducts branch
Gland and Epithelium of the penile urethra
Simple Acinar Gland Transitional Epithelium (urothelium)
Gland of the salivary glands
Submandibular
compound tubulo-acinar gland
Light stain - tubular, mucous cells
Dark stain - acini, serous cells (granules)
Sweat gland
Simple coiled tubular
Sebaceous gland
Simple branched acinar glands
Glands of the pancreas
exocrine - compound acinar glands
Pavement epithelium
Simple squamous epithelium
flattened, irregularly shaped cells forming a continuous surface
lines surfaces - involved in diffusion (passive transport) of gases/fluids
Respiratory epithelium
Pseudostratified columnar ciliated epithelium appears to have more than one layer of cells, but in reality is a single later with all cells attached to basement membrane Polar nuclei (basal side)
