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    do you know the pressure changes in both the pulmonary artery and aorta are they the same for instance as the pressure in the pulmonary artery increases the same happens to the pressure in the aorta?
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    or is it the other way round?
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    Your question is unclear. But i think the pressure do increase at the same time, there's a graph where you can see this, however the pressure in the Aorta will be greater due to the distance the blood must travel.
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    As Witches_Rave has said the question is unclear.

    What I can say though is that the pressure of the blood pumped by the right ventricle via the pulmonary artery is less than that generated by ventricular systole in the left ventricle. The muscle wall in the right ventricle is 2-3 times smaller than that of the left side. This is because less force is needed as the heart and lungs are located in close proximity as they are adjacent in the chest cavity. This is the pulmonary circulation. Also, the alveoli and capillaries at the gaseous echange surface are two cells thick (approx 1micron) to reduce the diffusion pathway and increase the rate of diffusion. It contains no tissue fluid so is very fragile. This is another reason why the pressure is lower, so that it doesn't cause the capillaries to burst and/or damage the alveolar walls.
    A much larger contraction is needed from the left ventricle which pumps blood to the rest of the body to overcome the resistance of the systemic circulation and to pump the blood further and faster in order to deliver nutrients such as O2 and glucose to body tissues and to remove waste materials such as CO2 and urea efficiently. Pressure =force/area. The arteries have a narrow lumen and a relatively thick layer of smooth muscle to maintain high pressure.

    Sorry about the long winded nature of the post. Hopefully that might clear up some things.
 
 
 
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