Introduction to the human bod Levels of structural complexit ntake of raw materials and elimination of The internal environment and Dietary intake 11 Elimination of waste 12 homeostasis 4 Protection and survival 12 Homeostasis 5 Protection against the external Negative feedback mechanisms 6 environment 12 Positive feedback mecha Resistance and immunity 13 Homeostatic imbalance 7 Movement 13 Reproduction 14 Survival needs of the body 7 Communication 8 Introduction to the study of Transport systems 8 illness 14 nternal communication 9 Petiole 15 Communication with the external Pathe environment 10Introduction to the human body Levels of structural complexity The internal environment and homeostasis 4 Homeostasis 5 Negative feedback mechanisms 6 Positive feedback mechanisms 7 Homeostatic imbalance 7 Survival needs of the body 7 Communication 8 Transport systems 8 Internal communication 9 Communication with the external environment 10 Intake of raw materials and elimination of waste 11 Intake of oxygen 11 Dietary intake 11 Elimination of waste 12 Protection and survival 12 Protection against the external environment 12 Resistance and immunity 13 Movement 13 Reproduction 14 Introduction to the study of illness 14 Aetiology 15 Pathogenesis 15