ANA300Y1 Lecture Notes - Lecture 2: Exocrine Gland, Blood Vessel, Tral
Document Summary
Epithelia covers free body surfaces. Differentiation: selective gene expression, determines structural and functional characteristics that define cell type. Tissue: a relatively homogenous collection of structurally and/or functionally similar cells and cells products. If you look at an organ, it"s a heterogeneous structure (many different cell types) Tissue: cells are similar to each other appearance, function, etc. Histology: the study of tissues, 4 primary tissue types: epithelial tissue connective tissue. Neural tissue tissues combine to form organs with distinct structures and functions. External body surface is lined by an epithelium. Internal body surfaces are lined by epithelia (3 free surfaces) Space inside is also filled with fluid. Endothelium: specialized term for the epithelium that lines blood vessels. Pleural cavities: contain lungs, lined by the pleura. Pericardial cavity: contains the heart, lined by the pericardium. Peritoneal cavity: contains abdominopelvic viscera, lined by the peritoneum. Epithelium is classified as either: simple epithelia: 1 layer of cells.
