what systems rely on the circulatory system
The heart relies on the respiratory system because without oxygen, blood cant flow. The circulation system gives oxygen to the digestive system organs to keep them alive and carries nutrients from the digestive system to every cell in the body. The circulatory system is comprised of the heart, lungs and blood vessels. Simply, de-oxygenated blood enters the heart and goes to the lungs via the pulmonary vein. In the lu â¦ ngs is where blood picks up oxygen through diffusion with the alveoli. Oxygen, what we breathe in, is diffused for carbon dioxide, what we breathe out and other wastes.