Two different mechanisms relay the information brought by the hormone to the target cell. Some hormones enter the cell and bind to a receptor-protein in the cytoplasm, the gelatin-like substance encasing the nucleus. Together, the hormone and receptor move to the nucleus, bind to the chromosome, and cause the cell to synthesize certain proteins.
Other hormones do not enter the cell at all. They bind to receptor-proteins on the cell’s surface and trigger the release of a second messenger in the cytoplasm. It is this compound that the initiates the cell’s response to the hormones.
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