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The blood leaving the lungs is loaded with oxygen, while blood entering the lungs is about to get oxygen from the respiratory system.
carbon dioxide
Blood coming from the lungs has lower pressure while that from the heart has higher pressure. Blood coming from the lungs also has higher oxygen content and lower carbon dioxide content compared to that coming from the heart.
Blood leaving the lungs is oxygenated
The blood entering from the lungs has a high oxygen content and the blood entering from the body is high in carbon dioxide.
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The lungs.
Two primary gases are found in the blood stream. Leaving the capillaries and going out into the tissue is OXYGEN which was carried by the hemoglobin in the red blood cell. Leaving the tissue and entering the capillary is CARBON DIOXIDE or "CO2" which is transported via carbonated water (aka carbonic acid) in the plasma of the blood stream.
Gases as a law exist independently of each other Gases move rapidly and randomly So in the alveoli (lungs air bags) we have "fresh" air entering this has Approx 80% Nitrogen 19%oxygen and a little carbon-di-oxide and other gases. In our blood we have high carbon-di-oxide levels in the air we have low carbon-di-oxide levels and vice versa for oxygen If you have smelled perfume and noticed that you can smell it from far away that's a result of diffusion. Effectively the respiratory gases diffuse to equalize in concentration in both the blood and in alveoli. Basically in blood (deoxygenated) CO2 concentration is 50 mmHg in the air sacs it is 45 mmHg so they try t equalize. This results in carbon-di-oxide leaving the blood and entering the alveoli. The same thing happens to the oxygen. It's higher in air than in blood so the oxygen moves from high concentration (in air) to low concentration (in blood) The end result is carbbon-di-oxide leaving blood and oxygen entering blood this is a basic!!! overview of the gas exchange. Easiest answer: Capillary
Blood entering the left atrium is oxygenated blood coming from the lungs that is pumped throughout the rest of the body.
Carbon dioxide, when combined in liquid is mildly acidic. When you exhale, you're outgassing CO2. This would result in a small pH change making your blood less acidic as CO2 is released and O2 taken up.
Of course blood involve in transportation of respiratory gases. So blood carry CO2 to lungs.