Are chemical messengers mostly manufactured by the endocrine glands, and can they influence our interest in sex, food, and aggression?
A) Yes, they are primarily produced by the endocrine glands and can influence these behaviors.
B) No, they are produced by various organs and systems in the body, and do not affect these behaviors.
C) Yes, they are mainly synthesized by the nervous system and can impact these behaviors.
D) No, they are primarily produced by the digestive system and do not influence these behaviors.
