Question

Why is the skeletal system referred to as an "organ" system, since it is not made up of organs?

Answer 1

But it is an organ system.

Explanation:

Each and every bone is an organ of the larger skeletal system.

Makes some sense now, doesn't it? Especially when you think about it.

Every named artery (aorta, pulmonary artery) are organs of the cardiovascular system so each bone is an organ.