BIOL 1410 Lecture Notes - Lecture 7: Histology, Desmosome, Chondroitin
15 Dec 2015
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Tissue: a group of cells with similar structure and function, 4 major tissue types: Epithelial tissue any place with a hole is lined by epithelial tissue. Nervous tissue control the muscle tissues. Points of contact between adjacent cells - seen in epithelial tissue, some: cell junctions (in some tissues) nervous and muscle cells. 3 types of cell junctions: tight junctions. Are a partial fusion of specific proteins on the lateral surface of the cell membrane. Prevents material from passing between cells e. g. bacteria, proteins, sometimes fluid or ions (depending on the tissue: anchoring junctions (e. g. desmosomes) Important in cardiac and smooth muscle (allows synchronization of contractions) Also found in epithelial tissue: 4 major tissue types (overview, epithelial tissue. Lines body/organ cavities: organ cavity = lumen. Characteristics of epithelia: has one free surface, little extracellular space between cells, avascular no blood vessels epithelial tissues never have blood, basement membrane vessels in them.
