Can you tell me about human hormones and feedback mechanisms..?

Endocrinology: Hi. Hormones are signaling molecules made in one place (their gland) and circulate via the bloodstream to regulate function at other tissues ("target tissues"). Main hormone categories are peptide/protein (e.g., insulin), steroid (e.g., cortisol), biogenic amine (e.g., epinephrine), others. Typically there is feedback regulation of hormone secretion to keep some process in a normal range.