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Clinical Anatomy For Dummies. The tissues of the pectoral girdle need oxygen. So a complex series of arteries supplies blood flow through the shoulder, upper arm and chest area. And because the axilla includes several important lymph nodes, that lymph has to flow.
They carry O2 poor blood into the right atrium which then flows to the right ventricle through the tricuspid valve. The rigâ¦ht ventricle pumps the blood through the pulmonary semi-lunar valve to the pulmonary artery. It then travels to the lungs so gas exchange can happen and the blood is now O2 rich.