Final answer:
A systemic disease is a disease that affects the body as a whole due to under- or overfunctioning.
Step-by-step explanation:
A disease that affects the body as a whole, often due to under- or overfunctioning is called a systemic disease.
An example of a systemic disease is diabetes, which affects the entire body by disrupting the regulation of blood sugar levels.
In contrast, parasitic, occupational, and contagious are not specific terms used to describe diseases that affect the body as a whole.
Learn more about Systemic diseases