Claude Bernard

Claude Bernard (1813–1878) was a French physiologist whose experiments helped establish modern experimental medicine. He developed the concept of the internal environment, later called homeostasis.

Experimental medicine: A medical approach that uses controlled experiments to investigate disease and test treatments. Bernard helped establish experiment as a method for explaining bodily function and disease.
Glycogen: A branched glucose-storage polysaccharide found mainly in animal liver and muscle. Bernard’s discovery of liver glycogen challenged the idea that the liver only transformed dietary sugar.
Pancreatic juice: The digestive secretion produced by the pancreas, containing enzymes and bicarbonate. Bernard investigated its role in digestion, including the breakdown of fats.
François Magendie: A French physiologist who advanced experimental physiology and taught Claude Bernard. Magendie’s laboratory and experimental approach shaped Bernard’s early scientific career.
Laboratory medicine: The use of laboratory methods and tests to investigate, diagnose, and manage disease. His experimental program strengthened the laboratory’s role in medical knowledge.
Physiology: The study of how living organisms and their parts function. Bernard’s research made physiological processes central to experimental medicine.
Glycogenesis: The synthesis of glycogen from glucose or other precursors. Bernard’s liver experiments helped establish that animals can form stored carbohydrate.
Pancreatic lipase: An enzyme that hydrolyzes dietary triglycerides into fatty acids and glycerol-related products. His research connected pancreatic secretion with the digestion of fat.
Émile Littré: A French physician, lexicographer, and philosopher who wrote about Bernard’s scientific work. Littré helped present Bernard’s methods and ideas to a wider intellectual audience.
Animal testing: The use of nonhuman animals in scientific research and product or treatment testing. Bernard’s reliance on animal experiments became a touchstone in arguments about research ethics.

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