Systems in the human body — AQA GCSE Combined Science Synergy

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1. Systems in the human body can be studied at macroscopic, microscopic and molecular scales. The study of respiration helps to account for the need for exchange surfaces in multicellular organisms, illustrated by the human circulatory system. The study of the digestive system focuses on the chemical changes to the main nutrients in the diet. Finally, examples of the way that body systems are controlled is illustrated with reference to the nervous system and the endocrine system. In Lifestyle and health (page 50) the importance of the endocrine system is further illustrated in the context of lifestyle and health.