Hormones

• Types of Hormones - based on chemical structure

  steroid hormone, amine - based hormones, peptide and protein hormones
• Cross cell membrane easily

  steroid hormones - lipid based hormones
• Modified amino acids


  amine based hormones - water soluble; cannot cross cell membranes
• Made from chains of amino acids

  peptide and protein hormones - water soluble; cannot cross cell membranes
• Steroid Hormones


  produced from cholesterol molecules, require transport proteins to travel in blood, testosterone and estrogens
• Amine Hormones


  do not require transport proteins in blood, melatonin, epinephrine, and norepinephrine
• Peptide and Protein Hormones

  chains of amino acids, do not require transport proteins in blood, antidiuretic hormone and insulin