Eating food to gain energy, Digestive + Circulatory – break down food and distribute nutrients, Running to escape danger, Muscular + Skeletal – enable body movement, Breathing faster during exercise, Respiratory + Circulatory – supply oxygen during activity, Removing waste from the body, Excretory + Circulatory – filter and remove wastes, Growing taller and repairing tissues, Digestive + Skeletal – support growth and development, Feeling hungry and deciding to eat, Nervous + Digestive – control hunger and eating behavior, Sweating to cool down the body, Integumentary + Nervous – regulate body temperature, Delivering oxygen and nutrients to cells, Circulatory system – transports materials throughout the body, Producing energy inside cells, Digestive + Respiratory – provide nutrients and oxygen for energy, Removing carbon dioxide from the body, Respiratory system – removes carbon dioxide

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