14. Epithelial Tissue Flashcards
Which regional domain of Epithelial tissue communicates with adjacent cells?
The Lateral Domain
What are the four types of Apical Specializations?
Cilia, Flagella, Microvilli, and Steriocilia
For Microvilli
What is their function?
What makes up the core of each Microvillus?
Absorption
Actin
Where might one find Sterocilia / Stereovilli?
The Epididymis and the Sensory Cells of the Inner Ear
What differentiates Stereocilia from Microvilli?
Stereocilia are much longer.
What makes up the core of Cilia?
An Axoneme
(Microtubules)
What are the three types of Cilia and their functions?
Motile: Beat in a wave like fashion to move substances
Primary: Immobile, but function as chemo-/osmo-/mechano- sensors
Nodal: Embryonic, help determine left/right axis
What is the function of Occluding Junctions?
Where do you find them on the cell?
They are impermeable.
Near the most apical surface.
What would you find in the Zonula Adherens?
Anchoring Junctions
What is the function of Anchoring Junctions?
Link a cell to the cytoskeleton of adjacent cells
What is another name for a Macula Adherens?
A Desmosome
Both Desmosomes and Adherins Junctions use what type of Cell Adhesion Molecule?
Cadherins
What is the function of Gap Junctions?
What cell adhesion molecule do they use?
Mediate communication between cells
Connexin
What do Focal Adhesions do?
What cell adhesion molecule do they use?
Anchor Actin filaments to the Basement Membrane
Integrins
Where might you find Simple Squamous Epithelium?
Lining the Blood and Lymph Vessels (Endothelium)
Lining of Serous Membranes (Mesothelium)
Lining Alveoli, Loop of Henle, Ducts
Where might you find Simple Cuboidal Epithelium?
Kidney Tubules, Glands, and Associated Ducts.
Terminal Bronchioles
Covering of the Ovary
Where might you find Simple Columnar Epithelium?
Auditory Tubes
Uterus
Oviducts
Stomach
Small / Large Intestines
Gallbladder
Where might you find Pseudostratified Columnar Ciliated Epithelium?
Lining of the Nasal Cavity
Pharynx
Trachea
Bronchi
(Respiratory System except the Terminal Bronchioles)
Where might you find Urothelium?
Urinary Bladder
Ureters
Urethra
What is the special function of the Urothelium?
It is distensible
Where might you find Nonkeratinized Stratified Squamous Epithelium?
Oral Cavity
Portions of the Pharynx
Esophagus
Anus
Vagina
Urethra
Cornea
What is special about the Apical Layer of Keratinized Stratified Squamous Epithelium?
The cells there do not have Nuclei
Where might you find Stratified Cuboidal Epithelium?
Sweat Glands and Ducts
Ovarian Follicles
Salivary Gland Ducts
What kind of membranes are the Peritoneum, Pericardium, and Pleura?
Serous Membranes
What is the method of secretion for a Merocrine Cell?
Secretory products are wrapped in membrane bound vesicles to the apical surface and released via exocytosis.
What is the method of secretion for an Holocrine cell?
The secretory product builds up inside of a cell to the point where the cell ruptures, releasing the product along with cell debris.
What is the method of secretion for an Apocrine cell?
The secretory product is released along with the Apical portion of the cell. The secretory product will be within the cytoplasm surrounded by the plasma membrane of the Apical portion of the cell.
What is the example given for a Unicellular Gland?
Goblet Cell
What function does a Goblet Cell perform?
Secretes mucus into the GI tract.
What is another name for the secretory portion of a multicellular gland?
The Acinus
What sort of secretions are formed in the Parotid Gland?
Serous
What sort of secretions are formed in the Sublingual Gland?
Mucous
What kind of secretions are formed in the Submandibular Gland?
Both Serous and Mucous
