Question

How is oxygen and carbon dioxide transported in humanbeings

Answer 1

Exchange of gases takes place between the alveoli of lungs and the surrounding blood capillaries.

The two main gases exchanged are oxygen and carbon-dioxide.

Oxygen is absorbed by the blood capillaries from the lungs alveoli by diffusion while

carbon-dioxide is absorbed by the lungs alveoli from blood capillaries by diffusion.

Answer 2

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Haemoglobin transports oxygen molecule to all the body cells for cellular respiration. The haemoglobin pigment present in the blood gets attached to four O2molecules 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 O2to the body cells, blood takes away CO2which is the end product of cellular respiration. Now the blood becomes de-oxygenated.

Since haemoglobin pigment has less affinity for CO2, CO2is mainly transported in the dissolved form. This de-oxygenated blood gives CO2to lung alveoli and takes O2 in return.

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