Negative ions such as chloride and phosphate are pulled out of the filtrate by the positive charge established by the sodium that was actively transported into the blood.

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This is because the positive charge established by the active transport of sodium ions into the blood attracts negatively charged ions such as chloride and phosphate, causing them to be pulled out of the filtrate and into the blood.

Negative Ions Such as Chloride and Phosphate Are Pulled Out