Introduction to the respiratory system organs: The respiratory system is the system of the human body by which it produces energy needed for life processes. 1  This energy is produced by the breaking down of glucose molecules in all living cells of the human body.
The most susceptible organs and systems effected by diabetes are the eyes, the kidneys, the nerves, the cardiovascular system. The only system I recall not being effected by diabetes is the respiratory system but I can't be 100% on that.
Type 2 diabetes can be easier to miss as it develops more slowly, especially in the early stages when it can be harder to spot the symptoms. But untreated diabetes affects many major organs, including your heart, blood vessels, nerves, eyes and kidneys.