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)
What is Glandular Epithelia?
Involved in glands, releases secretory products such as sweat, saliva, hormones, etc.
Paracellular vs Transcellular Transportation?
Paracellular is substances moving in BETWEEN cells, and Transcellular is substances moving through the individual cells.
What is Transitional Epithelia?
ONLY in the Urinary system, allows for the change of shape and flexibility when the cell expands.
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