EPITHELIAL TISSUE EPITHELIUM Epithelial tissue Epithelium Lining covering

EPITHELIAL TISSUE (EPITHELIUM)

Epithelial tissue (Epithelium) Lining, covering and glandular tissue of the body

Epithelial tissue (Epithelium) Examples: � Skin protects against bacteria/chemicals � Lining of the respiratory tract-cilia to sweep mucus � Kidney-epithelium absorbs and filters � Secretion-glands

Epithelial tissue (Epithelium)

Forms membranes for filtration/exchange

Glands/Ducts � Salivary Glands � Ducts in Pancreas Kidney tubules Surface of ovaries

Line digestive tract Goblet cells: produce mucus

Some cells are shorter than others Absorption and secretion Ciliated variety lines the respiratory tract Goblet cells make mucus Cilia move mucus

Pseudostratified (ciliated) columnar

Several layers of cells Can stand friction: Esophagus Mouth skin

Cells at base are cuboidal or columnar, free surface varies Tissue can stretch Lines the: Urinary bladder Ureters Part of urethra

Extracellular matrix Produced by connective tissue cells Secreted to exterior � Ground substance, proteins and large polysaccharides � Matrix fibers Gel like, to firm, to rock hard

Extracellular matrix

Extracellular matrix

Types of Connective Tissue Bone Cartilage Dense Connective Tissue Loose Connective Tissue Blood