Describe the source of the endogenous electric field.

part 1 .Electric Field Articles
Choose and read, one of the free full-text review articles below, which include endogenous electric fields (made naturally by the body). Some also include exogenous electric fields (from sources external to body).

Describe, explain, or question:
i.the source of the endogenous electric field
ii.a charged entity that the endogenous electric field affects
iii.a physical effect that occurs due to the endogenous electric field acting on charged entities
iv.a biological effect that occurs because of this physical effect
(for part 1 i will attach the pdf)

2.
Here are links to websites about membrane potentials.
i.What types of articles are these? (peer reviewed research, peer reviewed review, infomercial, news summary)
ii.Briefly explain what makes each type valuable in a different way.
iii.Briefly summarize something unexpected that you found interesting in each article. (You do not have to fully digest each article.)