A protein called haemoglobin in the red blood cells then carries the oxygen around your body. ... Blood without oxygen returns through the veins, to the right side of your heart. From there it is pumped to your lungs so that you can breathe out the carbon dioxide and breathe in more oxygen.
This answer is only true for people with type 2 diabetes or people who are at risk of getting diabetes.
The breathing process is controlled by the central nervous and respiratory systems. Hope I helped ^-^
