It is like the heart and lungs because it delivers/distributes things like oxygen, blood, and proteins around the cell:)
When you workout, muscles are being restored and aren’t used to this new activity so they still have to adjust.
Lupus autoimmune disease that affects any part of the body. Lupus affects multiple organs therefore different specialists would be needed to treat different organ systems that are affected. Some specialists include Dermatologists, cardiologists, nephrologists and pulmonologists.