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Question: within the body there are certain organs where minimising exposure...

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Within the body there are certain organs where minimising exposure to drugs is particularly important. These organs are typically 'protected' by a physiological barrier, such as the blood-brain barrier or the blood-retinal barrier. With the aid of a diagram, describe the key features of either the blood-brain or blood-retinal barrier that limit the uptake of drugs from the systemic circulation into the brain or eye, respectively. 

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