Blood from a donor is sterile and stored in a sealed bag, Biology

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Blood from a donor is sterile and stored in a sealed bag, but it is still kept at 4°C. What is the advantage of keeping it at this low temperature?

At 4 °C, enzyme activity is slowed down, so the rate of respiration (and as usage of food and oxygen) in the blood cells is slowed down. This enhances the possible storage time.

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