The correct answer is c a b. The term "pulmonary" refers to the lungs, so the first blank should be filled with "Lungs". The term "coronary" refers to the heart, so the second blank should be filled with "Heart". The term "systemic" refers to the body as a whole, so the third blank should be filled with "Body". Therefore, the correct answer is c a b, which represents Lungs, Heart, Body.