Eli5: How does Saline Solution work within the blood stream?

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Fellows,

I’m reading about donating blood, and they said that in large volume plasma donation, a replacement of saline is added to your blood stream to account for the large volume taken. I’m just wondering how it’s okay to just replace blood with Saline

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Your blood already contains a good amount of water so in order to maintain proper blood pressure levels, a saline solution can be added to your blood to maintain its volume. Kind of like adding water to a concentrated drink and your blood cells are still able to carry oxygen throughout your body even if your blood has been diluted this way.

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