Classification of hormones-Based on chemical structure

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Classification of hormones-Based on chemical structure

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The hormones are classified into the following based on chemical structure

1. Amino Acid Derivative

• SINGLE amino acid

• TYROSINE = (T3, T4) & Catecholamines (Epinephrine, Norepinephrine, Dopamine)

• TRYPTOPHAN -5-HT (Serotonin) & Melatonin

• ARGININE (Nitric Oxide)

2. Protein / Peptide

 MULTIPLE amino acid

 Acts on “EXTRACELLULAR RECEPTORS

 INSULIN (51 amino acids), PARATHORMONE (84 amino acids)

3. Cholesterol derivatives

• Crosses cell Membrane

• Acts on “INTRACELLULAR RECEPTORS”

• STEROID HORMONES (Aldosterone, Cortisol, Estrogen, Progesterone, Testosterone)

4. Vitamins

 VITAMIN A & D

 Acts on “INTRACELLULAR RECEPTORS