Why would destruction of pulm capillaries increase pressure of right ventricle?

[Codaster]

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Say your pulmonary capillaries are destroyed, reducing blood flow through them and on to the Left Atrium. Does pressure in the right ventricle rise simply because blood is coming the circulatory system at the same rate, but having a harder time flowing from RV --> lungs?

If that's true, wouldn't the pressure "build up" translate throughout the whole circuit and just raise the pressure of the entire loop?

Supposedly the left atrium/ventricle don't have pressure increased, however.

 

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the point is that all of the circulation must pass through the lungs from the RV. Just picture the loss of capilaries (or other disease that restricts pulmonary blood flow) as an obstruction to push against. This will lead to excess work done by the RV and RV hypertrophy and everything along those lines, but will not affect the LA because the left side of the heart is downstream of the blockage.