Identify And Explain The Changes In An Adult's Circulation System

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When a baby is born, the first breathes are taken and the lungs begin to expand. As the lungs expand, the lungs are cleared of fluid. There is an increase in the baby's blood pressure and a significant decrease in the pulmonary pressures. This reduces the need for the body to shunt blood. These changes promote the closure of the shunt. These changes increase the pressure in the left atrium of the heart, which also decreases the pressure in the right atrium. The shift in pressure promotes the foramen ovale to close.
The process for an adult’s circulation system starts with non-oxygenated blood entering the right atrium from the inferior and superior vena cava. Once in the right atrium the tricuspid valve opens and drains the blood to the right

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