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All of the blood cells in your body are mixed together in a slightly yellowish liquid called Plasma. Plasma is mostly made up of water, but also contains proteins, sugars and salt. In addition to carrying blood cells throughout the body, plasma also carries hormones, nutrients and chemicals, such as iron.

Plasma has the important function of maintaining the pH of the blood at approximately 7.4.

I knew about red cells but not white cells or even plasma.
— Jenni,
elementary school student
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