Production of body heat(4) is not a function of the skeletal system?

Explanation:
The skeletal system is an important system for any living being. Humans skeletal system for example, has a network of 206 bones, ligaments, cartilages and tendons.

The skeletal system has the following functions
1. Locomotion
2. Support to the body
3. Protection
4. Blood cell production
5. Storage of minerals
6. Endocrine system regulation

And in no way, the skeletal system is involved in the production of body heat. Thus the answer is Production of body heat (Option 4)