Answer:
During inhalation
oxygen comes into alveoli of the lungs. The alveoli is surrounded by very thin
blood vessels called capillaries carrying blood in them. So the oxygen diffuses
out from the alveoli walls to the blood. The oxygen is carried by blood to all
the parts of body by haemoglobin present in blood.
The blood passes through the tissues of the body, the
oxygen present in it diffuses into the cells (due to its higher concentration
in the blood). This oxygen combines with the digested food present in the cells
to release energy. Carbon dioxide is produced as a waste product during
respiration in the cells of the body tissues. This CO2 diffuses into
the blood (due to its higher concentration in body tissues). Blood carries the
CO2 back to the lungs where it diffuses into the alveoli of the
lungs into the trachea, nostrils and then out of the body into air. CO2
is more soluble in water than oxygen and hence mostly transported in the
dissolved form in our blood.
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