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How does protein hormones reach their target cells?

Answer

Usually in blood plasma, which carries them to their target cells. They 'recognize' these cells based on receptors on the cell membranes to which they bind.
Q&A Related to "How does protein hormones reach their target..."
Usually what happens is that it interacts with a cell-surface receptor, and the receptor releases a "second messenger" into the cell.
http://answers.yahoo.com/question/index?qid=201011...
Peptide hormones are composed of amino
http://www.chacha.com/question/when-a-peptide-horm...
This because target cells have special receptors that recognize the shape of that protein. Other cells that don't need that hormone will have no receptor and will not respond to it.
http://au.answers.yahoo.com/question/index?qid=201...
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