Figure 2.

The subcellular distribution of energy use varies according to cell type. (A) Granule cells. Most energy is used to propagate action potentials and maintain the resting potential along the long parallel fibres. (B) Purkinje cells. Most energy is used on action potentials and postsynaptic receptors. (C, D) Inhibitory neurons use most energy on postsynaptic currents and action potentials. (C) Molecular layer interneurons. (D) Golgi cells. Key: rp, resting potential; ap, action potentials; post-syn, postsynaptic receptors; re-cyc, transmitter recycling (ATP used on glial uptake of transmitter and its metabolic processing, and on packaging transmitter into vesicles in the releasing cell); pre-syn, presynaptic Ca²⁺ entry and vesicle cycling.