Answer:
The respiratory system and circulatory system work together to supply oxygen to the body and remove waste products:
Respiratory system
When you breathe in, air travels down into your lungs' air sacs, or alveoli, where gas exchange takes place. The diaphragm, a large muscle under your lungs, helps with this process by pulling downward to create a vacuum that rushes air into your lungs. When you breathe out, the diaphragm relaxes and pushes upward on your lungs, forcing them to deflate.
Circulatory system
The circulatory system, also known as the cardiovascular system, is made up of the heart and blood vessels that run throughout the body. The heart's pumping action creates pressure differences within the circulatory system that cause blood to move. Blood carries oxygen and nutrients from the lungs to tissues and organs throughout the body, and also removes carbon dioxide and waste products.