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The Importance of Integrative Physiology
Hormones are internal chemical messengers transported in the bloodstream. The word hormone actually comes from ancient Greek sort of homage to Hippocrates and co, meaning to setting in motion. So when a hormone arrives at a cell, wherever that is, it needs to get into the cell. It gets into the cell and it makes a B line straight for the nucleus where the DNA is,. And it directs gene expression, i.e. it selects out a particular sequence in the DNA and says, right, we want that one, transcribe, please, we need that particular protein made.