Systems in the Human Body
Digestive, circulatory and respiratory systems
Systems in the Human Body
The digestive system breaks down food into nutrients. The circulatory system transports oxygen and nutrients to cells. The respiratory system exchanges gases — oxygen in, carbon dioxide out. These systems are interdependent.
Example
How Systems Work Together
When you eat, the digestive system breaks food into glucose. The circulatory system carries glucose and oxygen to cells. Cells use these for respiration, producing energy. Waste CO2 is carried back by blood and exhaled by the lungs.
Note
Key Point
Lifestyle choices affect all body systems. Smoking damages respiratory, poor diet stresses digestive, and lack of exercise weakens circulatory. Making healthy choices protects all your body systems.
Key Vocabulary
Digestive systemOrgans that break down food into nutrients the body can absorb
Circulatory systemThe heart, blood vessels, and blood that transport substances around the body
Respiratory systemThe lungs and airways that bring oxygen in and remove carbon dioxide
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Digestive system
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