The August Krogh Principle: "For many problems there is an animal on which it can be most conveniently studied".
The idea stated in the title, first clearly expressed by August Krogh, is illustrated by examples from animal biochemistry, physiology, general cell biology, experimental medicine, ethology and botany. General aspects of the concept are discussed.
D000076:Acetabularia / Q000166:cytology; D000818:Animals; D001001:Anura / Q000378:metabolism; D001369:Axons / Q000502:physiology; D002432:Cecum / Q000502:physiology; D010856:Columbidae / Q000378:metabolism; D006224:Cricetinae; D003582:Cytogenetics; D049832:Decapodiformes / Q000502:physiology; D003718:Denmark; D004330:Drosophila / Q000166:cytology; D004524:Eels / Q000502:physiology; D004557:Electric Organ / Q000502:physiology; D005399:Fishes / Q000502:physiology; D005426:Flight, Animal; D006168:Guinea Pigs; D000882:Haplorhini; D006430:Hemiptera / Q000502:physiology; D049673:History, 20th Century; D008931:Mitochondria, Muscle / Q000378:metabolism; D009132:Muscles / Q000378:metabolism; D010827:Physiology / Q000266:history; D010946:Plants, Medicinal; D012106:Research; D012964:Sodium / Q000378:metabolism; D001743:Urinary Bladder / Q000378:metabolism
D012964:Sodium