Final answer:
The nervous system and endocrine system work together to maintain homeostasis and control the functions of other organ systems in the human body.
Step-by-step explanation:
The interaction of two biological systems for a specific purpose in the human body is that the nervous system and endocrine system work together to maintain homeostasis and control the functions of other organ systems. The nervous system controls voluntary and involuntary body activities through electrical signals, while the endocrine system produces hormones that regulate body processes. These systems communicate and coordinate to ensure the proper functioning of the body.