What is the primary difference in the way the nervous and endocrine systems communicate with their target cells?

Which of the following correctly describes the functions of the endocrine system?

a. Transport of blood through the body and through the lungs

b. Regulation of body functions through hormone secretion

c. Regulation of body functions through nerve impulses

d. Immunity and returning extra tissue fluid to the blood vessels

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

b. Autocrine signals affect the same cells that secrete them.