Which substances enter the filtrate by active secretion?
1. Hydrogen
2. Potassium
3. Phosphate
4. Chloride
5. Sodium
Correct Answer: 1,2,3
Rationale 1: Hydrogen is pumped into filtrate by molecular pumps.
Rationale 2: Potassium is pumped into filtrate by molecular pumps.
Rationale 3: Phosphate is pumped into filtrate by molecular pumps.
Rationale 4: Chloride does not enter filtrate by active secretion.
Rationale 5: Sodium does not enter filtrate by active secretion.
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