what is the relationship between the digestive, respiratory, and circulatory systems ad how do they interact?
Digestive system digests the complex food material into simple molecules that are released into the blood stream.
Respiratory system purify the blood by the diffusion of oxygen and elimination of CO2.
Finally circulatory system carry simple food molecules from digestive system and oxygen from respiratory system to all the parts of the body.
Thus all the organs of the body get sufficient food and oxygen. By using oxygen, food is completely oxidized into chemical energy, ATP via cellular respiration.
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