Concept:Hormones are chemical messengers carried by the blood that produce automatic, involuntary effects on target organs.
Explanation:Hormone release and action are controlled by the endocrine system.
Their responses do not depend on our will.
Thus, saying that hormonal responses are voluntary is incorrect.
Hormones can act on more than one target organ.
They are chemical messengers found in animals.
They travel through the bloodstream to reach their specific targets.
So, all the other options correctly describe hormones.
Answer:A. Their responses are voluntary