Which two body systems work together to regulate the functions in your body?

The two body systems that work together to regulate the functions in your body are the nervous system and the endocrine system.

1. The Nervous System: This system uses electrical signals to quickly transmit messages between cells. It's responsible for receiving information about the environment around us (sensory function), for processing that information (integrative function), and for responding to it (motor function). It includes the brain, spinal cord, and nerves.

2. The Endocrine System: This system uses hormones to regulate the functions of cells and organs. These hormones are released into the bloodstream and transported to cells and organs throughout the body. The endocrine system includes glands such as the pituitary, thyroid, and adrenal glands.

Together, these two systems control and coordinate the body's responses to changes in the environment, and they regulate growth, development, metabolism, and homeostasis (the body's internal balance).