Explains animal systems and their function in this introductory text for pre-veterinary or veterinary tech students, and for students in animal-related curricula. Gross and microscopic anatomical structures are explored to help students build a basic foundation for future study and clinical practice. This third edition contains a new chapter on basics of structure and function, with explanations of anatomical terms and orientation, and expanded coverage of avian-specific physiology to reflect the role of poultry in agriculture.