Educational worksheet on human body systems from Chapter 2: Cell as the basic unit of life.

Diagrams of five human body systems: skeletal, nervous, circulatory, respiratory, digestive, and muscular systems, with labels for body system, function, and main organ involved.

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Final Answer:
| Diagram | 1 | 2 | 3 | 4 | 5 | 6 |
|---------|---|---|---|---|---|---|
| Body system | Skeletal | Nervous | Circulatory | Respiratory | Digestive | Muscular |
| Function | Supports body, protects organs, allows movement | Controls body actions and senses; sends signals | Transports blood (oxygen, nutrients, waste) | Takes in oxygen, removes carbon dioxide | Breaks down food, absorbs nutrients | Moves bones, helps posture and heat production |
| Main organ involved | Bones (e.g., femur, skull) | Brain and spinal cord | Heart | Lungs | Stomach and intestines | Skeletal muscles (e.g., biceps) |

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