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Blood leaving the lungs has all its haemoglobin oxygenated and gives up oxygen to tissues due to one of the following reasons:

[A].	The tissues can absorb oxygen from oxyhaemoglobin	[B].	Oxygen concentration in tissues is lower and CO2 concentration is higher than in lungs
[C].	Oxyaemoglobin undergoes reduction	[D].	Oxygen concentration in tissues is higher and CO2 concentration is

Answer: Option B