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As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli. Carbon dioxide follows the same path, but in the opposite direction, moving from the blood in the capillaries to the air in the alveoli and then getting exhaled. Less than 10 percent of the total quantity of carbon dioxide carried in the blood is eliminated during passage through the lungs

Complete elimination would lead to large changes in acidity between arterial and venous blood. At the same time, carbon dioxide (which is produced by cells during respiration) diffuses from the blood (where its concentration is higher) into the alveoli (where its concentration is lower) to be exhaled. Once in the lungs, oxygen is moved into the bloodstream and carried through your body

At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide

Your bloodstream then carries this waste gas back to the lungs where it is removed from the bloodstream and then exhaled. Breathing out requires no effort from your body unless you have a lung disease or are doing physical activity. Carbon dioxide is the product of cellular respiration, and is transported from the cells of tissues in the body to the alveoli of the lungs through the bloodstream. Gas exchange is the process by which oxygen and carbon dioxide move between the bloodstream and the lungs

This is the primary function of the respiratory system It is essential to ensure a constant supply of oxygen to tissues, as well as removing carbon dioxide to prevent its accumulation. Gas molecules move from a region of high concentration to a region of low concentration Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.

Oxygen and carbon dioxide move independently of each other

They diffuse down their own pressure gradients As blood leaves the lungs through the pulmonary veins, the venous p o 2 = 100 mm hg, whereas the venous p co 2 = 40 mm hg. Carbon dioxide diffuses into the alveoli

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