Tissues A Powerpoint : Epithelial Tissues

A set of vocabulary flashcards covering the classification, characteristics, and examples of epithelial and glandular tissues based on the lecture notes.

Tissues

Groups of cells similar in structure and function.

The Four Types of Tissues

Epithelial, Connective, Muscle, and Nerve.

Cellularity

A characteristic of epithelial tissue where it is composed almost entirely of cells.

Special Contacts

Structures like tight junctions and desmosomes that hold epithelial cells together to form continuous sheets.

Polarity

The existence of apical (top) and basal (bottom) surfaces in epithelial tissue.

Avascular but Innervated

A characteristic of epithelial tissue where it contains no blood vessels but is supplied by nerve fibers.

Regenerative

The ability of epithelial tissue to rapidly replace lost cells through cell division.

Simple Epithelium

An epithelial classification consisting of a single layer of cells.

Stratified Epithelium

An epithelial classification consisting of two or more cell layers.

Squamous Cells

Epithelial cells that are flattened and scale-like.

Cuboidal Cells

Epithelial cells that are boxlike or cube-shaped.

Columnar Cells

Epithelial cells that are tall and column-shaped.

Simple Squamous Epithelium

A single layer of flattened cells with disc-shaped nuclei that functions in diffusion and filtration.

Simple Cuboidal Epithelium

A single layer of cubelike cells with large, spherical central nuclei that functions in secretion and absorption.

Simple Columnar Epithelium

A single layer of tall cells with round to oval nuclei; functions include absorption and secretion of mucus.

Goblet Cells

Unicellular mucus-secreting glands often found in simple columnar and pseudostratified columnar epithelia.

Pseudostratified Columnar Epithelium

A single layer of cells of differing heights where nuclei are seen at different levels; functions in secretion and propulsion of mucus.

Stratified Squamous Epithelium

A thick membrane of several layers that protects underlying areas from abrasion; forms the external skin epidermis.

Stratified Cuboidal Epithelium

A rare tissue type typically two cell layers thick, found in some sweat and mammary glands.

Stratified Columnar Epithelium

A tissue with limited distribution found in the pharynx, male urethra, and lining some glandular ducts.

Transitional Epithelium

A type of epithelium that stretches to permit the distension of the urinary bladder.

Gland

One or more cells that makes and secretes an aqueous fluid.

Endocrine Glands

Ductless glands that produce hormones such as amino acids, proteins, glycoproteins, and steroids.

Exocrine Glands

Glands that secrete products onto body surfaces or into body cavities, such as mucous, sweat, oil, and salivary glands.

Simple Duct Structure

A classification of multicellular exocrine glands where the duct does not branch.

Compound Duct Structure

A classification of multicellular exocrine glands where the duct branches.

Tubular Secretory Structure

A categorization of glands where the secretory cells form tubes.

Alveolar Secretory Structure

A categorization of glands where the secretory cells form small, flasklike sacs.

Brunner's Glands

An example of compound tubular exocrine glands found in the small intestine.

Sebaceous Glands

An example of simple branched alveolar exocrine glands.

Endocrine Glands

Ductless glands that produce hormones released directly into the blood or lymphatic fluid.

Exocrine Glands

Glands that secrete products onto body surfaces or into body cavities; examples include mucous, sweat, and salivary glands.