Lymphatic vascular diseases. These could potentially cause lymphedema. That is swelling due to difficulties of the normal draining of the lymph nodes. Respiratory system. As blood flows in the capillaries while in the lungs, carbon dioxide is removed and oxygen is picked up. The carbon dioxide leaves your body through the lungs. https://www.sgvascularctr.com/a-comprehensive-approach-to-lymphoedema-treatment-a-vascular-surgeons-perspective/