What role does the heart play in the respiratory system?

The circulatory system (the heart and blood vessels) interact with the respiratory system by delivering the O2 from the lungs (gained by inhaling) to tissues of the body, and also to carry the CO2 from the body tissues to the lungs for removal from the body (exhaling). read more

The main function of the respiratory system is gas exchange. There are two involuntary drives that can cause us to take our next breath. For the vast majority, what makes us breathe is a buildup of CO2 in our blood. This is called the hypercapnic drove. read more