Organ Systems:Interrelations Between Organ Systems:
It should be fairly obvious by now that all of the various organ systems are closely interrelated. Each depends upon the others in order to function.
If any one of them could be considered central, though, it’s probably the cardiovascular system, since its task is to distribute substances throughout the body. As such, any change in the functioning of the cardiovascular system will quickly impact the functioning of every other body system.
Take the digestive system, for example. Every cell in the body requires organic molecules (
nutrients) in order to build cellular structures, and also for generation of energy. It’s the job of the digestive system to take in food and process it into molecules that can be absorbed and used by body cells. But how does the digested food get to body cells? It is absorbed from the digestive system by the blood and then transported to body cells by the cardiovascular system.
It is the function of the urinary (
excretory) system to remove the toxic substances body cells produce from the body. But how do these substances get from body cells to the kidneys for excretion? Again, they are absorbed from body cells into the blood, and then transported by the cardiovascular system to the kidneys for processing and excretion.
In order to break down organic molecules for energy, body cells need oxygen. The process produces poisonous carbon dioxide as a waste product. The respiratory system brings oxygen into the body and excretes carbon dioxide, but how does the oxygen get to the body cells that need it, and how does the CO
2 get to the lungs for excretion?
Well, I think that the answer should be pretty obvious by now.

All of the various body systems are interconnected.