Which system is affected by neurotoxic substances?

Dreaming occurs in

$I.Q.$ is the ratio of mental age to

Pioneer work on conditioned reflex was done by

Which of the following systems are involved in the regulation and coordination of the human body?
$I -$ Digestive system
$II -$ Endocrine system
$III -$ Excretory system
$IV -$ Nervous system
$V -$ Reproductive system

Sensation of stomach pain is due to