Question

how is oxygen and carbon dioxide transported in human being

Answer 1

the process of respiration and the oxygen takes from never knows they will close to lungs and exchange of gases takes place and carbon dioxide then return back to then throw knows it releases back

Answer 2

Oxygen is absorbed by plant capillaries from lungs alveoli by diffusion while carbon dioxide is absorbed by lungs alveoli from blood capillaries by diffusion transport of energy and carbon dioxide occurs  with the help of respiratory pigment called hemoglobin