Which system does the nervous system signal to release hormones due to environmental changes?

The nervous system signals the endocrine system to release hormones in response to environmental changes. Specifically, the hypothalamus in the brain detects these changes and communicates with the pituitary gland, which then releases various hormones that regulate other endocrine glands throughout the body. This interaction helps maintain homeostasis and facilitates the body's response to stress, temperature changes, and other external stimuli.