Why do all the other systems need digestive system?
For example,
• The circulatory system would not be able to transport nutrients to the cells
• The respiratory system would not be able to provide oxygen to the cells
• The muscular system would not be able to contract
• The nervous system would not be able to function properly
Ultimately, without a properly functioning digestive system, the body would not be able to survive. Therefore, all of the other systems depend on the digestive system for proper nutrition and health.