The word homeostasis comes from ancient Greek and is the union of the two words homeo and stasis. Homois means “similar”, and stasis means “to stand still”, which gives the idea of ​​“remaining the same”. The human body is made up of millions of cells that work together to maintain the entire organism, and although the cells have different functions, they all require the same metabolic demands. To ensure the survival of the cells of the human body, oxygen, glucose, minerals and the elimination of waste are necessary; as well as the maintenance of a constant internal environment, in order to guarantee the well-being of individual cells and the entire organism (BBC, 2011). Homeostasis, as the etymology suggests, is the process by which the body's systems regulate its internal environment. Homeostasis is the human body's attempt to maintain a constant and stable internal environment and to do so requires constant monitoring and adjustments as conditions change. Homeostasis is very important because processes such as osmosis or diffusion need a stable and controlled environment to be successful, while if the condition of the internal environment is wrong, even a simple process can go wrong (My Tutor, 2017) . The human body relies on a series of negative feedbacks to adapt, limit fluctuations and maintain a good internal environment. Negative feedback is the action of reversing the direction of a change, with the intent of maintaining stability, which is why it is used in homeostasis. An example of negative feedback occurs in thermoregulation. When the body temperature increases, skin receptors sense the change, together with the hypothalamus, and activate a command from the brain. This command will correct the change, telling the sweat glands to decrease the body temperature level through sweating. This adjustment constantly made by each individual system is called homeostasis regulation. This regulation is mainly formed by three mechanisms: receptor, control center and effector. The receptor perceives the change in the environment, while the control center processes the information received from the receptor. Finally, the effector implements the information received from the control center, decreasing or increasing the stimulus. In the example of thermoregulation in the human body, the temperature receptors in the skin are the receptors, the hypothalamus and the brain in general are the control center, and the blood vessels together with the sweat glands are the effectors. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay Homeostasis is the process in which all systems of the human body, even seemingly unrelated ones, work together to maintain balance, stability, and a good internal environment. The circulatory system is a good example of how systems work together constantly. The heart of the circulatory system pumps blood through blood vessels throughout the body, providing nutrients collected by the digestive system, oxygen collected by the respiratory system, and hormones collected by the endocrine system. It apparently collects the waste products produced by every single cell in the body and delivers them to the exocrine system or excretory system. The brain and nervous system constantly receive fresh oxygen from the circulatory system and in return make the heart beat, regulate health rhythm and blood pressure. The respiratory system relies on blood vessels to collect and deliver inhaled oxygen, while the heart muscles rely on the lungs to provide oxygen in order to function. The excretory system is expected to remove waste products from the body, that's why it comes to it constantly.