Problem 2

Background and context

Blood flows through the heart twice, therefore humans have a double circulatory system. Oxygen and carbon dioxide are able to move independently of each other. They diffuse according to their own pressure gradients. The blood leaves from the lungs using the pulmonary veins.  Then venous PO2 = 100 mm Hg and the venous PCO2 = 40 mm Hg and when blood enters into the systemic capillaries then the blood losses oxygen and gains carbon dioxide due to the pressure difference of the tissues and blood. The flow of blood within the body is as shown:

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