Explores the role of the body's circulatory and respiratory systems, emphasizing things we can do to maintain these important systems. Regular exercise, healthy eating habits, and not smoking are just a few of the things people should do to maintain healthy circulatory and respiratory systems. Some of the more common health problems associated with these systems are discussed including heart disease, high blood pressure, upper respiratory infections, and asthma. Other terminology includes: cardiovascular system, heart, blood, blood vessels, lungs, and lung cancer. .