The instructions to make the hormone are in the DNA in the nucleus.
The specific instruction to make the hormone is known as the gene for that hormone. A gene is on a chromosome.
The nucleus copies the instructions in the DNA into a molecule called mRNA.
The mRNA molecule leaves the nucleus through a nuclear pore and attaches to a ribosome. In this case, the ribosome is attached to rough ER.
The ribosome reads the instructions and uses the codes to assemble the hormone (protein).
The assembled protein inside the rough ER is pinched off in a vesicle and transported to the Golgi apparatus.
The Golgi apparatus packages the protein and may also modify it so that it is ready for release. The protein is now packaged into a vesicle and moved to the cell surface membrane, where it is secreted outside.
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