A INTRODUCTION * The endocrine system is one of the most complex body systems whose most important function, in conjunction with the nervous system is to release hormones in response to a change in the concentration of "trigger substances" in the blood or body fluids.
(The endocrine system; is; one of the most complex body systems) (the most complex body systems; is; to release hormones in response to a change in the concentration of "trigger substances" in the blood or body fluids)
The endocrine system the most complex body systems
is is
one of the most complex body systems
to release hormones in response to a change in the concentration of "trigger substances" in the blood or body fluids