Epithelial Tissues Flashcards
Prelims
It has several long secretory portions that join together to drain in 1 duct.
Simple Branched Tubular
They have epithelial ducts carrying their secretions to specific sites.
Exocrine Glands
It involves the release of products by means of exocytosis at the apical end of the secretory cells.
Merocrine Secretion
What are the 4 Basic Tissue Types?
- Epithelial
- Connective
- Muscle
- Nervous
Elaborate the characteristics of Epithelial Tissue
- Variable in shape and dimensions
- The cells’ size and morphology is dictated by their function.
- Nuclei vary in shape, and corresponds to the cell shape.
- The number and shape of stained nuclei is an indicator of the cells’ shape and density which is an important criterion for classifying epithelia.
- Polarity
- Lie at the basement membrane
- Avascular
Which Type of Epithelium?
- Conjunctiva
Stratified Columnar
What are the 2 main functions of an epithelial tissue?
- Lining of surface or body cavities
- Glandular secretion
What are the transmembrane link proteins found in gap junctions?
Connexins
These are larger projecting structures with a well-organized core of microtubules that propel material along a surface.
Cilia
Which Type of Epithelium?
- Urinary Tract
Transitional
Which Type of Epithelium?
- Trachea
Ciliated Pseudostratified Columnar
Oligosaccharide components of mucus stain well with _________.
PAS stain
Which Type of Epithelium?
- Skin
Stratified Squamous Keratinized
A square/cuboid shape of of the cell
Cuboidal
It faces the lumen (space).
Apical Pole
How can we describe the amount of extracellular matrix in epithelial tissue?
Small
How can we describe the amount of extracellular matrix in muscle tissue?
Moderate
Which Type of Epithelium?
- Uterine Tube
Simple Columnar
A layer of the ovaries and seminiferous tubules.
Germinal Epithelium
Give an example of Merocrine secretion
Most exocrine glands
It is made up of flat cells that lines the blood vessels.
Endothelium
These are exocrine glands producing mucus.
Mucous Glands
These are glands that do not have their ducts branch.
Simple Glands
What are examples of simple coiled tubular glands?
Sweat glands
Elaborate the functions of Epithelial Tissue
- Lining and covering of internal and external surfaces
- Protection against abrasion and injury
- Absorption of materials
- Transportation of materials
- Gas exchange
- Secretion
- Lubrication
Which Type of Epithelium?
- Lining of Loop of Henle
Simple Squamous
What are the main functions of a connective tissue?
Support and protection of tissues/organs
It functions in the synthesis and secretion of specialized products.
Secretory Epithelia and Glands
A thin meshwork of type IV collagen and laminin produced by the epithelial cells.
Basal Lamina
Which Type of Epithelium?
- Urinary Bladder
Transitional
How can we describe the cells of nervous tissue?
Elongated with extremely fine processes
How can we describe epithelial cells?
Aggregated, polyhedral cells
What are examples of simple branched tubular glands?
Glands in the uterus and stomach
These are glands that have their ducts branch.
Compound Glands
It is a tissue in which cells are bound tightly together to form a sheet-like or tubular structure.
Epithelial Tissue
What are the main functions of muscle tissue?
Strong contraction and body movements
Why do serous glands stain darkly with H&E?
Because of its RER and secretory granules.
These are small membrane proteins that increases epithelial cell’s apical surface area for absorption.
Microvilli
Which Type of Epithelium?
- Lining of Kidney Tubules
Simple Cuboidal
What are the apical structures found on epithelial cells?
Microvilli, Stereocillia, and Cilia
Which Type of Epithelium?
- Glomerular Capsule
Simple Squamous
Elaborate the different classes of Simple Glands
- Simple Tubular
- Simple Branched Tubular
- Simple Coiled Tubular
- Simple Acinar
- Simple Branched Acinar
It secretes mucus and creates a layer of protection.
Goblet Cells
It seals adjacent cells to one another, controlling the passage of molecules between them, and separates the apical and basolateral membrane domains.
Occluding or Tight Junctions
Which Type of Epithelium?
- Ducts of Sweat Glands
Stratified Cuboidal
Which Type of Epithelium?
- Vagina
Stratified Squamous Non-Keratinized
Which Type of Epithelium?
- Anal Canal
Stratified Squamous Non-Keratinized
What are the functions of the basement membrane?
- Attach the epithelia to the connective tissue
- Regulate (filter) substances
- Provides a guide or scaffold during tissue generation
- Compartmentalize epithelial cells