Brain Metabolism


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•  Brain metabolism requires large energy inputs

The human brain consumes ~20% of the body’s energy levels, despite making up only ~2% of the body’s mass

  • The brain’s rate of energy consumption varies little, regardless of the level of physical exertion by the body

The large amounts of energy required by the brain are used to sustain neurons and their processes

  • Energy is needed to maintain a resting potential when neurons are not firing (Na+/K+ pump uses ATP)
  • Energy is used to synthesise large numbers of neurotransmitters to facilitate neuronal communication

Metabolic Activity of Body Organs

brain metabolism