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Which membranes separate the interstitial fluid from the blood plasma and the interstitial fluid from the intracellular fluid, respectively?

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Correct Answer: B. The capillary wall and the cell surface membrane
The ISF (interstitial fluid) is the fluid outside the blood vessels while the blood plasma is the fluid within the blood vessels. Thus, the two fluids are separated by the wall of the blood vessels (i.e. the capillary wall). The ICF (intracellular fluid) of the cells bathing in the ISF are separated from their environment by the cell surface membrane, in accordance with answer choice B. You should be aware that human cells, unlike bacteria, do not contain a cell wall.
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