Passive transport occurs in the case of

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(B) Passive transport refers to the movement of substances across a membrane without the expenditure of metabolic energy $(ATP)$.In the context of the

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Chloride ions

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(B) Passive transport refers to the movement of substances across a membrane without the expenditure of metabolic energy $(ATP)$.In the context of the renal tubules,sodium ions $(Na^+)$ are actively reabsorbed from the filtrate into the blood,which requires energy.As a result of this active transport of $Na^+$,an electrochemical gradient is created.To maintain electrical neutrality,chloride ions $(Cl^-)$ follow the sodium ions passively across the tubular membrane.

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