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The textbook is divided into systematic chapters, each dedicated to a major physiological system. The content generally covers: 1. Nutrition and Digestion Mechanisms of food intake across different animal phyla. Physiology of digestion, including enzymatic actions.

For those who prefer a physical copy, the book is widely available for purchase:

Transport of gases, mechanism of breathing, and respiratory pigments.

Structure and function of the nephron, nitrogenous waste elimination (ammonotelism, ureotelism, uricotelism), and fluid balance across marine, freshwater, and terrestrial animals.