Organ systems such as the integumentary, skeletal, nervous, and endocrine systems all play an important role in helping the body maintain homeostasis. The integumentary system helps maintain itself by providing protection, regulating body temperature and sensory receptors. All of this plays an important role in maintaining the internal conditions for the body to function. The skeletal system helps by producing red blood cells to replace old ones that die. It also helps maintain calcium levels in our bloodstream. The nervous system maintains homeostasis by controlling and regulating other parts of the body, for example by letting you know when you are tired or when you are hungry. It makes sure that the body acts as it should by using receptors. The endocrine system releases hormones that are sent to different parts of the body that control the body's reaction to things like stress, pain, and growth. These hormones cue the body's fight-or-flight response so it can adapt and maintain itself