Marquitta is studying for a quiz and records in her notes that glucose is the main source of fuel for the nervous system and enters the brain via _____.
A) active transport
B) passive transport
C) gaps in the ventricles
D) gaps in the blood-brain barrier

Question

Quizplus · Accepted Answer

Glucose enters the brain via active transport, which requires the use of energy to move molecules across a membrane. This is necessary because the blood-brain barrier tightly regulates what can enter the brain, and glucose needs to be actively transported to ensure it can reach the nervous system. Passive transport (B) does not require energy and would not be sufficient for moving glucose into the brain. Gaps in the ventricles (C) and gaps in the blood-brain barrier (D) are not accurate descriptions of how glucose enters the brain.

Marquitta Is Studying for a Quiz and Records in Her