Nerve fibres in the brain might create pairs of particles connected by quantum entanglement. If confirmed through experiments, this phenomenon could help explain how millions of brain cells synchronize their activity to function properly.
“When a brain is active, millions of neurons fire at the same time,” says Yong-Cong Chen from Shanghai University in China. This requires even distant cells to coordinate their timing, but what mechanism do they use? “If evolution was looking for an efficient way to communicate over long distances, quantum entanglement…”
Source: https://www.newscientist.com/article/2441936-nerve-fibres-in-the-brain-could-generate-quantum-entanglement/