Final answer:
Peptide hormones are produced through DNA transcription to mRNA and then translation into an amino acid chain, being synthesized in the endoplasmic reticulum before being packaged in the Golgi and released in response to stimuli.
Step-by-step explanation:
Peptide hormones are initially manufactured in cells by a process similar to that of other body proteins. The manufacturing process starts with the transcription of DNA into mRNA, which is then translated into an amino acid chain, forming the peptide hormone. These hormones, which include short chains of amino acids like antidiuretic hormone and oxytocin, as well as larger proteins such as growth hormone and glycoproteins like follicle-stimulating hormone, are synthesized in the endoplasmic reticulum of cells and packaged into vesicles within the Golgi apparatus. When required, these peptide hormones are released into the bloodstream in response to specific stimuli.