The human brain, as a part of the nervous system, interacts with all the other systems in the body.
The brain regulates the respiratory rate, stimulates defense mechanisms against infection, and controls the pituitary gland and other endocrine glands, which affects the hormone balance. It also regulates the speed at which food moves through the digestive tract, controls drinking and feeding behavior, and regulates the position of bones by controlling muscles. The brain is both in control of and dependant on other body systems to function properly. Below is a breakdown of how the nervous system, particularly the brain, is connected to all the other systems in the body, and the resulting impact on one’s mental health.