february 24 - February 24 Bio Organization of the Human...

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February 24 Bio Organization of the Human Body hierarchy: cells → tissues → organs → organ systems Tissues = groups of similar cells that work together to perform a specific function cells in the tissue are held together by cell junctions (connections) and other support structures cell-cell junctions all three types are held together by plasma membrane proteins tight junctions = forms an impenetrable barrier; very selective; the only way substances can move across is if they have special proteins found between epithelial cells of the digestive tract, where they prevent digestive enzymes and microorganisms from entering the blood adhesion junctions = primary goal is strength; keeps cells from falling apart when you stretch or pinch a tissue they are not found up and down the entire length of the cell material can still move between the cells; not forming a barrier or seal linking together the cytoskeletons of multiple cells you can find a lot in the skin
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This note was uploaded on 04/08/2009 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas.

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february 24 - February 24 Bio Organization of the Human...

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