In the past, studies have focused on the stiffness of the larger arteries in the lungs. (physiologyinfo.org)
The symptoms we see in cats are mostly due to blockage of arteries in the lungs. (2ndchance.info)
The immature worms» arrival into the small arteries in the lungs initiates a severe inflammatory response that damages not only the arteries, but also the bronchioles (small airways) and alveoli (air sacs where gas exchange in the lungs takes place). (www2.vet.cornell.edu)