Colloids differ from crystalloids in that
1. they contain electrolytes.
2. they readily leave the blood and enter cells.
3. they are too large to cross membranes.
4. they promote urine output.
Correct Answer: 3
Rationale 1: Colloids are made up of protein and other large molecules.
Rationale 2: Crystalloids, not colloids, readily cross into cells. Colloids contain proteins that are too large to leave the blood.
Rationale 3: Colloids contain proteins that are too large to leave the blood.
Rationale 4: Crystalloids promote urine output, whereas colloids increase oncotic pressure.
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