They also play a role in neurotransmission and synaptic connections,<ref name="doi:10.1111/j.1742-4658.2008.06515.x"></ref> and in physiological processes like breathing.<ref name="doi:10.1126/science.1190721"></ref> While glia were thought to outnumber neurons by a ratio of 10:1, a recent study provides evidence for a ratio of less than 1:1.