Which statement about brain energy use in early childhood is accurate?

Which statement about brain energy use in early childhood is accurate?

• A. The brain's energy demand is unusually low in early childhood
• B. The brain's energy demand is relatively high in early childhood
• C. The brain's energy demand is negligible
• D. The brain's energy demand cannot be measured

Answer: (B)

During early childhood, the brain’s energy demand is high because the brain is rapidly developing. This period involves intense formation and refinement of neural connections—synaptogenesis, dendritic growth, and myelination—which require a lot of energy to power ATP-dependent processes. Neurons need energy for maintaining ion gradients, neurotransmitter production, and building new cellular material as circuits are wired for thinking, movement, and sensation. To support this growth, the brain receives a substantial share of the body’s blood flow and glucose supply, more than in later years. That’s why brain energy use cannot be considered negligible or unmeasurable; scientists can track it with imaging methods that measure glucose uptake or blood flow, confirming a relatively high metabolic demand in this stage.

During early childhood, the brain’s energy demand is high because the brain is rapidly developing. This period involves intense formation and refinement of neural connections—synaptogenesis, dendritic growth, and myelination—which require a lot of energy to power ATP-dependent processes. Neurons need energy for maintaining ion gradients, neurotransmitter production, and building new cellular material as circuits are wired for thinking, movement, and sensation. To support this growth, the brain receives a substantial share of the body’s blood flow and glucose supply, more than in later years. That’s why brain energy use cannot be considered negligible or unmeasurable; scientists can track it with imaging methods that measure glucose uptake or blood flow, confirming a relatively high metabolic demand in this stage.