The hormone is a semiochemical substance in animals or plants; it is a 
semiochemical substance synthesized by highly differentiated endocrine cells and 
secreted directly into the blood.
  The hormone is an important substance that regulates the normal activities 
of the body. Neither of them can initiate a new metabolic process in the 
body.
  The hormone is roughly divided into four categories according to chemical 
structure:
  The first category is steroids, such as adrenocortical hormones and sex 
hormones.
  The second category is amino acid derivatives, such as thyroxine, adrenal 
medulla hormone, pineal hormone, etc.

  The structure of the third type of hormone is peptide and protein, such as 
hypothalamic hormone, pituitary hormone, gastrointestinal hormone, calcitonin, 
and so on.
  The fourth category is fatty acid derivatives, such as prostaglandins.
  The above is the relevant content summarized by the editor of Kangyuan 
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