Home » Nervous System MCQs » Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid Nervous System MCQs Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid September 22, 2022 18 Views Q. Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid: sodiumchloridecalciumpotassiummagnesium Answer: potassium