Question

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Answer 1

Explanation:

(i) Oxygen enters the human body through the nasal passage and reaches the lungs. (ii) Numerous alveoli are present in the lungs. These alveoli are surrounded by many blood capillaries. From the alveoli, O2 is taken up by the red blood cells present in the blood capillaries. (iii) Similarly, the CO2 from the various

tissues is transported to the alveoli. (iv) This CO2 is then released through the nasal passage during exhalation. Alveoli are the sites of exchange of gases. Each lung contains 300-350 million alveoli. These alveoli increase the surface area for gaseous exchange, making the process of respiration more efficient.

Answer 2

Explanation:

Transport of Oxygen: Haemoglobin transports oxygen molecule to all the body cells for cellular respiration .The haemoglobin pigment present in the blood gets attached to O2 molecules that are obtained from breathing and thus forms oxyhaemoglobin .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 and blood becomes de-oxygenated.

Transport of carbon dioxide: Since haemoglobin pigment has less affinity for CO2, CO2 is mainly transported in the dissolved form. This deoxygenated blood gives CO2 to lung alveoli and takes O2 in return

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