Hormones are specified by their different chemical structures, which can be classified into four categories: amines, small molecules originating from amino acids; prostaglandins, cyclic unsaturated hydroxyl fatty acids synthesized in membranes from 20 carbon fatty acid chains; steroid hormones, cyclic hydrocarbon derivatives synthesized in all instances from the precursor steroid cholesterol; and peptide and protein hormones, the largest and most complex hormones (Mani et al., 1997). ... Nervous System and Endocrine System Interplay The nervous and endocrine systems are related in three main ...

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There are three specific groups of drugs used in controlling and reducing the effects of Parkinson's disease: anticholinergic drugs, dopaminergic drugs, and dopamine-like drugs. ... The levodopa is absorbed from gut to plasma and transferred from plasma to brain by the active transport mechanism for large neural amino acids (Quinn 1995). ...

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