Epithelial tissues Flashcards
Simple squamous epithelium
Location: Air sacs of lungs and the lining of the heart, blood vessels, and lymphatic vessels
Function: Allows materials to pass through by diffusion and filtration, and secretes lubricating substance
Simple cuboidal epithelium
Location: In ducts and secretory portions of small glands and in kidney tubules
Function: Absorption and Secretion
Simple columnar epithelium
Location Lining of the stomach, intestine, gallbladder, uterine tubes, and collecting ducts of kidney
Function: Absorption; and secretes mucus and enzymes
Pseudostratified columnar epithelium
Location: Ciliated tissue lines the trachea and much of the upper respiratory tract
Function: Secretes mucus; ciliated tissue moves mucus
Stratified squamous epithelium
Location: Lines the esophagus, mouth, and vagina
Function: Protects against abrasion
Stratified cuboidal epithelium
Location: Sweat glands, salivary glands, and mammary glands
Function: Protective tissue
Stratified columnar epithelium
Location: The male urethra and the ducts of some glands
Function: Secretes and protects
Transitional epithelium
Location: Lines the bladder, urethra, and the ureters
Function: Allows the urinary organs to expand and stretch
Fibroblasts
Abundant, large, relatively flat cells, often with tapered ends
Functions: produce fibers and ground substance of the extracellular matrix
Adipocytes
Fat cells with a single large lipid droplet
Functions: store lipid reserves
Macrophages
Large cells derived from monocytes in blood
Function: Phagocytes foreign substances
Mesenchymal cells
Spindle-shaped embryonic stem cells
Function: divide in response to injury to produce new connective tissue cells
Mast cells
Small cells with a granule-filled cytoplasm
Function: release histamine and heparin to stimulate local inflammation
Plasma cells
Small cells with a distinct nucleus derived from activated lymphocytes
Function: Attack foreign material (lymphocytes)
Leukocytes
White blood cells that enter connective tissue
