Indicate Whether the Characteristics Below Pertain to the Nervous System

Short Answer

Indicate whether the characteristics below pertain to the nervous system, endocrine system, or both by writing the appropriate letter in the blanks using the following answer code:
a.Applies to the nervous system
b.Applies to the endocrine system
c.Applies to both the nervous system and the endocrine system
-Alters target cells by using chemical messengers that interact with specific receptors of the target cells