Explain the link between the respiration and blood flow around the boyd

Respiration is needed in order for ATP to be produced by the body in order for it to carry out a variety of functions. In order for the process of repsiration to occur oxygen is needed. Oxygen is inhaled and absorbed into the blood via the alveoli in the lungs in the process of gas-exchange. Oxygen binds to red blood cells due to red blood cells having a high affinity for oxygen. Oxygen is then transported from the lungs to the heart via the pulmonary vein, the heart then pumps the newly oxgenated blood out of the heart to the rest of the body. Once the blood reaches the respiring cells via capillaries, the affinity for oxygen is much lower at the site of respiring cells so oxygen leaves the red blood cells and enters the respiring cells which then undergo the process of respiration to produce ATP. The red blood cells now carry the carbon dioxide back to the lungs from the respiring cells so it can be exhaled due to it's toxic nature.