I'm looking at the 12 GLUT transporters and the mechanisms of action for each. I've found that GLUT 1 & 2 are passive transporters and I was wondering if all 12 are passive transporters or if there's a different mechanism for vital areas in the body (like the brain, testis, kidney). I've found that GLUT 3,5,6,8,9, and 10 receptors are found on these vital tissues, do they perform passive transportation also? I'm using Lehninger's Principles of BioChm as a reference. Any help would be much appreciated. Thanks.
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