viii CONTENTS 



CHAPTER PAGE 



Triploblastic Animals 



Symmetry 



The Body Cavity 



The Body Plan 



Segmental Animals 



The Principle of Homology 



Protective and Supporting Structures 



The Chordate Exoskeleton 



The Endoskeleton 



The Human Skeleton 



The Human Architectural Plan 



Nutritive Mechanisms 



Fundamentals of an Animal Digestive System 



Abrading Mechanisms 



The Human Tooth 



Digestive Enzymes 



Absorption of Foods 



The Human Digestive System 



Digestion in the Mouth 



Digestion in the Stomach 



Digestion in the Intestine 



The Liver 



Fundamentals of a Respiratory System 



Types of Respiratory Systems 



Lungs 



Food and Oxygen Transport Systems 



Human Blood 



Transportation of Gases by the Blood 



Propulsion of the Blood 



The Vertebrate Heart 



The Human Heart 



Blood Pressure 



Disposal of Wastes of Metabolism 



Vertebrate Excretory Systems 



The Human Kidney 



Excretion by Skin 



Fate of Heat in the Animal Body 



Regulation of Body Temperature in Man 



Reproduction 



Fertilization 



Reproductive Organs 



The Vertebrate Reproductive System 



