GCSE Biology · AQA 8461 · Topic 4.2
Organisation
Key points
- Living things are organised as cells → tissues → organs → organ systems → organism.
- The digestive system breaks food into small soluble molecules using enzymes.
- The heart, blood vessels and blood carry substances around the body; the lungs exchange gases.
- Non-communicable diseases such as coronary heart disease and cancer are linked to risk factors like smoking, diet and lack of exercise.
- In plants, leaves, stems and roots work together; xylem carries water and phloem carries sugars.
- Water loss from leaves (transpiration) is affected by temperature, humidity, wind and light.
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Organisation is about how cells work together. Multicellular organisms group specialised cells into tissues, organs and organ systems, and this topic follows that idea through human digestion, circulation and gas exchange, and through the…
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