Answer:
The circulatory system pumps blood around the body and the respiratory system facilitates exchange the gas that keeps the blood fresh. The heart is connected to heart via pulmonary arteries and veins. The circulatory system and respiratory systems work together to deliver oxygen and important nutrients to every cell in our bodies. all of our body cells require oxygen to conduct cellular respiration. In this process oxygen burns the nutrients from food we eat, providing energy for the cells. -larrystylinsonsup