Anatomy: Epithelial Tissue Flashcards
What is Histology?
Study of tissues
4 Main Tissues: Epithelial
Tightly packed sheets that covers surfaces
4 Main Tissues: Connective
Binds and connects all tissues together.
4 Main Tissues: Muscular
Generates Force
4 Main Tissues: Nervous
Generates, receives, and sends messages.
What is the Extracellular Matrix?
Gel-like substance that surrounds cells of tissue – provides strength and cohesiveness.
Cell Junctions: Tight Junctions
Seals Junctions, allows for close connection between cells.
Cell Junctions: Gap Junctions
Allows for material to pass from one cell to the next.
Cell Junctions: Desmosomes
Gives strength and anchor to tissues.
What are the different strengths of Epithelial Tissues?
Protection, immune defense, secretion, transportation into other tissues, sensation
Simple vs Stratified Epithelia
Simple has a single cell layer, while Stratified has more than one cell layer.
What are the components of an Epithelial Cell?
Tightly packed cells connected by tight junctions and desmosomes; Resistant to physical stress; They are avascular (lack blood cells, obtains oxygen & nutrients from deeper tissues that diffuse).
Epithelial Tissue: Squamous Cells
Flat, tile-like cells.
Epithelial Tissue: Cuboidal Cells
Short (As Tall as they are Wide)
Epithelial Tissue: Columnar Cells
Tall & Elongated (Much Taller compared to how wide they are)