Submit Q4.10. Marathon runners can lose a great deal of Na" (through sweat). Some runners compensate by drinking large quantities of water (far more than they lost). In extreme cas this causes mental confusion and loss of muscle coordination. What is happening to the neurons of such a runner? The person has run out of neurotransmitter by firing too many action potentials. Nat loss and dilution results in increased KT entry into neurons through Na* channels Net loss and dilution has lowered the Nat concentration outside of neurons so that less Nat flo into neurons through open Nat channels Neutral oxygen molecules (Op) are entering through oxycan channels and depolarize the neuron Submit