NATS 1650 Lecture Notes - Lecture 2: Free Surface, Microvillus, Histology

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Tissues are a group of cells that are: similar in structure, perform a common or related function. Histology: the study of tissues: a subset of microscopic anatomy. Types of tissues: connective tissue (supports, muscle tissue (moves, epithelial tissue (protects, nervous tissue (controls) Two types: covering/lining epithelium: forms outer layer of skin and internal structures, glandular epithelium: forms glands of body. Functions of epithelia: protection, absorption, secretion, sensory reception. Apical surface: free surface exposed to exterior environment or cavity of organ -often have microvilli or cilia. Basal lamina: adhesive sheet basal surface; joins epithelial tissue to connective tissue. Epithelial tissue: fun facts: fit closely together to form continuous sheets, sit upon and are supported by connective tissue, avascular, but innervated, high regenerative capacity. Epithelial tissue: more layers= more protection, single layer mean it is easy for substances to pass through, cilia: often helpful in moving substances or involved in sensation.

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