a
Non-nutrient chemicals produced by the body in trace amoun ts that act as intercellular messenger are known as hormones.
b
Releasing and inh ibitory hormones are produced by the pituitary gland.
c
Adenoh ypophysis is under direct neural regulation of the hypothalamus.
d
Organ s in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones.