Part one --
Animals and their environment --
1: The diversity of animals and their interactions with natural environments --
2: Energy metabolism --
generating energy from food --
3: Cells, organisms and interactions with their environment --
Part two --
Water and salts --
4: Body fluid regulation: principles and processes --
5: Osmotic and ionic regulation in aquatic animals --
6: Water balance of land animals --
7: Kidneys and excretion --
Part three --
Temperature --
8: Temperature and the principles of heat exchange --
9: Temperature regulation in ectotherms --
10: Temperature regulation in endotherms --
Part four --
Oxygen --
11: The respiratory gases, gas exchange and transport: key characteristics and principles --
12: Respiratory systems --
13: Transport in respiratory systems, and acid-base balance --
14: Cardiovascular systems --
15: Environmental and behavioural influences on the cardiorespiratory system --
Part five --
Coordination and integration --
16: Neurons, nerves and nervous systems --
17: How animals sense their environments --
18: Muscles and animal movement --
19: Hormones --
20: Reproduction --
21: Control of sodium, water, and calcium balance --
22: Integration of the respiratory and circulatory systems.