Which of the following is true of the endocrine system? A. Hormones are made in one area and affect only organs within that area of the body. B. Hormones are made in the organ that they affect. C. Hormones made in one part of the body, like the brain, can affect organs located at the opposite end of the body, like the ovaries. D. Hormones and neurotransmitters work together to relay messages throughout the body.