Pulmonary Resistance 

I appreciate your scrutiny. Let me explain what I think you're missing. During exhalation, *alveolar* volume gets smaller which *decreases* the vascular resistance because the the extra alveolar vessels radius increases(less compression from alveoli). ***This happens only in exhalation from peak lung volumes until FRC***. Once you reach go beyond FRC to lower lung volumes, you have less elastic tissue to open up the blood vessels (this is the part you're referring to, but it only applies to FRC volumes and lower). In general, it is good practice to not start off with "you got it totally wrong", but rather to come to an understand where our understandings are different. I'm quite certain that you're missing half of the concept because if you were correct, we wouldn't have a U shaped curve, but a rather an L.

@Bobby McGarrison Elastic tissue does refer to things such as collagen but there are other connective tissue that play a part as well. Just as my video, I usually think of them as "springs and rubber bands" because it's easier to conceptualize. You're on the right track when you say that elasticity gives the lung a higher compliance (at certain lung volumes) but this refers to the ability of volume of *air* and pressures, not the blood vessels. The word "compliance" is about the air volume/pressures (air!). This video is talking about the blood vessels. The airway is different though you are correct that low lung volumes, compliance(air) is increased. I really like how you're trying to connect the two concepts together, but volume/pressure of air and blood resistance are two different topics. Why they don't act the same is a good question, and it has to related to status of the rubber band in the context of the blood vessels versus the rubber bands in the context of the chest wall with the volume.

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