You should know...
Blood enters the lungs from the pulmonary artery.
While in the lungs the blood off loads carbon dioxide and upload oxygen.
The oxygen rich blood returns to the heart via the pulmonary vein.
The heart pumps the oxygen rich blood via the aorta to three main areas in the body and their ancillaries: the brain, the digestive system or alimentary canal and the skeletal muscles system. While in these areas the blood will be offloading oxygen and uploading carbon dioxide.
The oxygen poor blood then returns to the heart via the systemic vein system.
The oxygen poor blood is then pumped by the heart via the pulmonary artery to the lungs and... the circuit is repeated.
Exam Question
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