A) action of the endocrine system is more localized than the action of the nervous system
B) action of the endocrine system is of shorter duration than the action of the nervous system
C) primary action of the endocrine system is to regulate muscle contraction and glandular secretion
D) endocrine system acts through chemical messengers called hormones and the nervous system acts through messengers called neurotransmitters

A) all body cells
B) only the cells where they are produced
C) only the cells that have receptor sites for the hormone
D) only cells that are activated by ATP