Why are they moving? Well, one reason is that they appear to go to the places in the cell where things are happening and where energy is needed. Energy needs to be produced in the right amount, in the right place, at the right time, and it goes through an unimaginably fast recycling process that involves mitochondria. The mitochondria that aren’t moving appear to stay in places where things are always happening—either near factories where proteins are made (ribosomes) or synapses where there is a lot of activity, which is a very important fact relevant to how the brain functions.
