Your heart is dependent on oxygen from your respiratory system, and it is delivered by the circulatory system.
The correct answer is the circulatory system. The circulatory system plays a vital role in delivering oxygen to the heart. When you breathe in, the respiratory system extracts oxygen from the air and it enters your bloodstream through tiny air sacs in the lungs called alveoli. The oxygenated blood is then transported by the circulatory system, specifically the arteries, to the heart. The heart pumps this oxygen-rich blood to the rest of the body, ensuring that all organs and tissues receive the oxygen they need to function properly. So, the circulatory system is responsible for delivering the oxygen from the respiratory system to the heart.
