Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Circulatory system (Angiology) 00:00:00 Carbon dioxide Oxygen Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan UniversityCopy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Circulatory system (Angiology)