What human body system sends signals to glands in the endocrine system to release hormones?
a. circulatory system
b. excretory system
c. nervous system
d. digestive system

the correct answer is c   with the systems

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.