BOTH THE ENDOCRINE AND NERVOUS SYSTEMS ARE MAJOR REGULATING SYSTEMS OF THE BODY; HOWEVER, THE NERVOUS SYSTEM HAS BEEN COMPARED TO AN AIRMAIL DELIVERY SYSTEM AND THE ENDOCRINE SYSTEM TO THE PONY EXPRESS. BRIEFLY EXPLAIN THIS COMPARISON.
THE NERVOUS SYSTEM EMPLOYS ELECTROCHEMICAL IMPULSES TO BRING ABOUT RAPID CONTROL, WHEREAS THE ENDOCRINE SYSTEM IS MORE SLOWLY ACTING WITH HORMONES.
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DEFINE HORMONE.
SUBSTANCE SECRETED BY ENDOCRINE TISSUES INTO THE BLOOD THAT ACTS ON THE TARGET TISSUE TO PRODUCE A SPECIFIC RESPONSE.
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CHEMICALLY, HORMONES BELONG CHIEFLY TO TWO MOLECULAR GROUPS, THE__1__ AND THE __2__.
1. STEROIDS
2. AMINO ACID-BASED
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