Which of the following system is most sensitive to atropine
Respiratory mucosa
Hea
Pupil
Gastrointestinal motility
Ref: HL Sharma 3rd ed: Pg no:154 The endpoint for atropinization is dried pulmonary secretions. Tachycardia and mydriasis must not be used to limit or to stop subsequent doses of atropine
Autonomic nervous system