How are they related to each other?
- Digestive
- Respiratory
- Circulatory & Immune
- Excretion
- Digestive
- Respiratory
- Circulatory & Immune
- Excretion
-
Well, that's definitely not all of the body systems. Anyway, aside from the obvious "They keep the human alive" answer:
The digestive system breaks food down into glucose.
The respiratory system provides oxygen to the cells and releases the carbon dioxide byproducts.
The circulatory system brings oxygen to the cells, so the cells can use it to break glucose down into ATP.
The excretory system disposes of byproducts and everything that our bodies cannot use in any of the above systems.
The digestive system breaks food down into glucose.
The respiratory system provides oxygen to the cells and releases the carbon dioxide byproducts.
The circulatory system brings oxygen to the cells, so the cells can use it to break glucose down into ATP.
The excretory system disposes of byproducts and everything that our bodies cannot use in any of the above systems.