Explain the difference in the relative concentrations of oxygen and carbon dioxide in the blood vessels entering and leaving the body organs if someone could give me awnser to this i’ll give u brainliest

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11