Name the two main organ systems that regulate and maintain homeostasis

Nervous and endocrine system

Explanation:

Different body systems participate in maintaining the stable internal environment irrespective of external environmental changes. The nervous system controls and regulates the function of different parts of the body. It maintains homeostasis by reporting any abnormal change through stimulus after which the brain directs the effector to take adaptive responses. Endocrine glands are responsible for producing hormones which are chemical messenger that travel throughout the body via blood. In order to maintain homeostasis, hormones stimulate the targeted organ or cell in an efficient way.