Blood clots. A blood vessel could be blocked by an embolus. This is the small mass of particles that moves in the bloodstream. Or it could be blocked by a thrombus. This is a blood clot. Respiratory method. As blood flows with the capillaries inside the lungs, carbon dioxide is eradicated and https://www.sgvascularctr.com/a-comprehensive-approach-to-lymphoedema-treatment-a-vascular-surgeons-perspective/