SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Lungs
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Heart
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Stomach
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Body
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Detailed explanation-1: -Air that we inhale ends up in the alveoli of the lungs. From the alveoli, it diffuses to the blood stream. In the blood stream it combines with haemoglobin to form oxyhaemoglobin .
Detailed explanation-2: -Once oxygen has entered the blood from the lungs, it can be bound by haemoglobin (Hb) in the red blood cells. Haemoglobin is a protein comprised of four subunits: two alpha subunits and two beta subunits. Each subunit has a haem group in the centre that contains iron and binds one oxygen molecule.
Detailed explanation-3: -Red blood cells squeeze through narrow capillaries in single file. Haemoglobin molecules inside red blood cells pick up and carry the oxygen. These oxygen-rich cells travel in the blood vessels from the lungs to the left side of the heart. The blood is then pumped around the body.
Detailed explanation-4: -So the correct answer is ‘Increasing O2 concentration in blood’.