This title covers physiology of organ systems of animals, including human and mammalian physiology. It surveys functional specialisation of organisms and their survival ability under environmental stresses. It explains criteria of physiological variations among organisms living in diverse habitats. It includes new coverage on animal calorimetry to explain energy requirements of animals. It has in-depth coverage of membrane physiology. It includes a new chapter on physiological disorders emanating from organellar malfunctions and genetic disabilities.