Probably because they surround the organs; like the heart for instance.
the root cage
carbonhydrates
Your organs are soft, and a hit could damage them. The skeleton provides a hard cage to surround them.
The heart is an organ; it contains no other organs within it.
The open circulatory system
pelvis
what governs organs such as the heart,stomach and intestines
Arteries carry blood from the heart to the organs of the body.
the heart, the stomach
The Heart. Because the heart supplies blood to the rest of the organs without it the other organs would fail
heart eyes brain