Question 3:
How is oxygen and carbon dioxide transported in human beings?
Answer
Haemoglobin transports oxygen molecule to all the body cells for cellular respiration.
The haemoglobin pigment present in the blood gets attached to four O2 molecules
that are obtained from breathing. It thus forms oxyhaemoglobin and the blood
becomes oxygenated. This oxygenated blood is then distributed to all the body cells
by the heart. After giving away O2 to the body cells, blood takes away CO2 which is
the end product of cellular respiration. Now the blood becomes de-oxygenated.
Since haemoglobin pigment has less affinity for CO2, CO2 is mainly transported in
the dissolved form. This de-oxygenated blood gives CO2 to lung alveoli and takes
O2 in return.
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