1) Alter 2) Arterialise 3) Change 4) Modify 1) Arterialise 
• (v. t.) To transform, as the venous blood, into arterial blood by exposure to oxygen in the lungs; to make arterial.
Ar·te'ri·al·ize transitive verb [ imperfect & past participle Arterialized ; present participle & verbal noun Arterializing .] To transform, as the venous blood, into arterial blood by exposure to oxygen in the lungs; to make arterial. 
[v] - change venous blood into arterial blood
arterialise verb change venous blood into arterial blood
to convert (venous blood) into arterial blood by the action of oxygen in the lungs.