Which system's pathologies include osteoporosis?

Osteoporosis is a pathology primarily associated with the skeletal system, characterized by a decrease in bone density and quality, which leads to an increased risk of fractures. This condition affects bone remodeling, where the balance between bone resorption and formation is disrupted, resulting in weaker bones. Factors that contribute to osteoporosis include hormonal changes, nutritional deficiencies (particularly calcium and vitamin D), and certain medical conditions or medications that can impact bone health.

While the muscular system supports and relies on the skeletal system for movement, it does not directly involve changes in bone density. The nervous system is responsible for signaling and coordination within the body but does not have a direct role in the pathologies of bone health. The circulatory system, while it plays a role in delivering nutrients and oxygen to the bones, is not directly related to bone density disorders such as osteoporosis. Thus, osteoporosis is clearly categorized under the skeletal system due to its direct impact and origin within bone structure and health.