Much of the energy that the brain expends is used for

signaling processes

Explanation:

Neurons within the brain are constantly processing and transmitting information. Electrical impulses that pass from one neuron to another consume a lot of energy. So, sending, receiving and processing the signals are the main events of brain energy expenditure. Neurons also use the energy for the maintenance of themselves and the surrounding glial cells.

Glucose is the main energy source in the brain.

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explanation: