Kidneys play a major role in helping to maintain proper levels of Na and K ions in the blood. If the kidneys fail to function properly, one of the direct consequences would be.

Kidneys play a major role in helping to maintain proper levels of Na and K ions in the blood. If the kidneys fail to function properly, one of the direct consequences would be "impaired nerve impulse transmission".

Explanation:

The propagation of a nerve impulse from one side of a neuron to the other happens as a result of electrical changes throughout the neuron membrane. The membrane of an unstimulated neuron is polarized — that is, the electrical charge differential between the external and the internal of the membrane.

A nervous impulse is transferred from a pre-synaptic neuron to a post-synaptic neuron through the synapse and Via the use of neurotransmitter diffusion. This increases the voltage in the neuron, allowing the calcium channels on the pre-synaptic neuron to open up.

i think it is dna, i'm not totally sure but i think it might be.