A - Intro and history_09

A - Intro and history_09 - The Endocrine System § The...

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Unformatted text preview: The Endocrine System § The body’s other main control system § Endocrine vs. nervous system? ¡ Signals used? ¡ Pathways used by the signals? ¡ Reaction time? § How do we define “ endocrinology ”? § What do comparative endocrinologists study? Historical perspective § Arnold Berthold (1859) – 1st recorded endocrine expt ¡ Why do similar looking chicks become male or female adults? ¡ Conclusions: w Testis & male w Remove testis & no secondary male sex characteristics w So… Action of testis is not dependent on innervation Historical perspective § William Bayliss and Ernest Starling – first “critical” endocrine experiment in 1902: In dogs, what causes (signals) release of bicarbonate by the pancreas? ¡ Cut pancreatic nerves & still get bicarbonate release ¡ Pulverize, then inject part of intestine ¡ bicarbonate is released; this is a chemical reflex caused by “ secretin ” § Considered “critical” as it was the first experiment to use a non-living extract to produce an effect Historical perspective summary...
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This note was uploaded on 02/10/2010 for the course BIO 420 taught by Professor Brookins during the Spring '10 term at Siena College (Loudonville).

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A - Intro and history_09 - The Endocrine System § The...

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