Why is milk given to someone who accidentally ingests a heavy metal ion such as silver or mercury?

Question

Why is milk given to someone who accidentally ingests a heavy metal ion such as silver or mercury?

Answer 1

the heavy metal ions will displace and damage protein sites in your body

if milk is ingested, those heavy metal ions will act on the proteins in the milk rather than the body

as a result, that certain someone would vomit up the heavy metal + milk mixture

Answer 2

It nuetralizes heavy metals and speeds them through the instestine and kidneys where they can be expelled.