Oxygen moves in the sequence 5, 3, 1 as shown by option C
How does oxygen move through the circulatory system?
During inhalation, oxygen first enters the lungs where it diffuses across the alveoli into the bloodstream, starting the journey through the circulatory system. Oxygenated blood is pumped by the left ventricle through the systemic circulation and reaches tissues through capillaries after attaching to hemoglobin in red blood cells.
While deoxygenated blood, which contains carbon dioxide, returns to the heart and is pumped to the lungs for gas exchange, oxygen is released for cellular use in capillaries. This dynamic process makes sure that cells always have oxygen to use and makes it easier to get rid of waste carbon dioxide.