ANAT 101 Lecture Notes - Antibody, Adipose Tissue, Adipocyte

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Tissues: collections of cells that perform specific, limited functions histology: the study of tissues, 4 types of tissues, epithelial, connective, muscle, neural. Functions of epithelia: provide physical protection (ex. skin protects from scrapes, control permeability (ex. any substance that enters/leaves body must cross epithelium, provide sensation (detect changes in environment, relay info to nervous system, produce specialized secretions (glandular epithelium) Exocrine: secretions discharged onto surface of epithelium (ex. perspiration) Endocrine: secretions released into surrounding tissue fluid and blood (ex. hormones) *to be effective, epithelial cells must be firmly attached to basement membrane. *if damaged, it is no longer an effective barrier cell adhesion molecules (cams): transmembrane proteins that connect large areas of opposing plasma membranes proteoglycans: thin layer that binds membranes together. 3 common cell junctions: tight junctions: keep cells attached, good permeability barrier (made of lipids, gap junctions: form pores between cels for communication.

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