(Clots tend to start in the legs or pelvis, but can break free and travel through the blood stream, lodging in small blood vessels in the lungs.) (health.com)
Pulmonary hypertension develops because of abnormal blood vessels in the lungs, which makes it harder for the heart to push blood through and provide oxygen to the rest of the body. (sciencedaily.com)
When these cells become unregulated, they create scarring, which leads to fibrosis and loss of functional blood vessels in the lungs. (sciencedaily.com)