PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water
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nutrients such as glucose
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fats
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metabolic waste such as urea
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Detailed explanation-1: -Answer and Explanation: The blood-brain barrier (BBB) is effective against d) metabolic waste such as urea. The brain relies solely on glucose as its source of nourishment, therefore glucose must be able to pass through the BBB. Anesthetics and alcohol are able to pass through the BBB due to their chemical structures.
Detailed explanation-2: -Answer and Explanation: The correct answer is D. Metabolic waste such as urea.
Detailed explanation-3: -Unfortunately for the brain, there is no barrier for ethanol. Ethanol crosses the blood-brain-barrier very easily. This is due to its chemical characteristics-although it is somewhat polar, it is also lipophilic, and so it mixes easily with the fat in the membrane.
Detailed explanation-4: -What is the purpose of the blood–brain barrier? It transmits electrical signals between neurons. It supplies nutrients while preventing hazardous chemicals from reaching the brain.