A health care provider is working for the Peace Corps in the Middle East. He has just treated several patients exhibiti

[answerhappygod]

A health care provider is working for the Peace Corps in the
Middle East. He has just treated several
patients exhibiting the symptoms described in this news
caption:
" Foaming at the mouth and struggling to breathe, their eyes
burning, the patients overwhelmed medics in the Syrian town
of Douma in the hours after 7:30 pm last Saturday...
Doctors were soon treating symptoms they had not seen before. Some
patients were convulsing, several had to pinpoint pupils, and
others had slow heartbeats that were barely keeping them
alive."
Q1: What receptors are involved in the symptoms described
here?
Q2: Which system has been activated (parasympathetic or
sympathetic)?
Q3: Can you think of any agents (drugs) that may have
caused the symptoms?
Q4: Is there an antidote that might work for these
patients? (it has to act quickly).