One of the two nerve passes through three different hormone is through biology biochemistry, physics, or through pressure waves. The fourth part way through the interaction of the magnetic field. Electric
One last nerve Two systems biology, physics, biochemistry, hormone or three passes through the pressure waves. The fourth way is through the interaction of electromagnetic fields.
One through the two through biochemical system is various hormones. Three through biological physics, or through the wave pressure. Part way through the interaction of magnetic field. The fourth power.