ANAT 212 Lecture Notes - Microfibril, Threonine, Carboxylic Acid
8 May 2013
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Document Summary
Multicelluar organisms are held together by 1) cell junctions/2) adhesions: cell junctions. Adherens junctions cell-cell junction junctions that connect intracellularly to actin. Focal adhesions cell-matrix junction extracellular matrx(ecm) junctions connectng to actin. Desmosomes cell-cell junctions connect intracellularly to intermediate filaments. Recall: 3 cytoskeleton filaments actin, intermediate filaments, &&& microtubules. Communicating junctions used for communicating chemically or metabolically gap junctions. Occluding junctions: is important in gut for glucose uptake: Only located right under microvilli(near lumen) where cell touches (near apical surface only, not at the base surface) There are channels located in the microvilli called na+ driven glucose symport, which faces the lumen of the gut, and brings na+ from lumen into the cell due to the na+ gradient that is greater in the lumen. This na+ driven glucose symport provides energy for glucose uptake since the glucose is greater in the cell than the lumen[unlike na+ conc"] glucose co-transports thru the na+ driven glucose symport.
