Category talk:Body systems

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What qualifies as a Body System?[edit source | reply | new]

I'm confused about this category. I thought that a "Body System" referred to something like the cardiovascular system, nervous system, immune system, etc.
But I've noticed that this category is being used for almost anything in the body.
Perhaps many of these items belong in subcategories of "Body System"? E.g. Immune cells would be in the "Immune System" category, not the "Body Systems" category.
And why is this "Body Systems" category a sub-category of "Disease"?
Pyrrhus (talk) 18:39, 26 March 2019 (EDT)