Homeostasis is the capacity of a system (open or closed) to maintain its balance operating within the constraints that are external. In terms of the human physiology, homeostasis is the dynamic equilibrium that keeps us alive (Mayo Clinic, 2010). It is the maintenance of all physical and chemical parameters of the body that should remain relatively constant (blood glucose, temperature, salt levels in the blood, etc.). Moreover, the fixity of the internal environment is the condition of a free and independent life: that is to say that we do not have to worry about the environment for change. Thus, with respect to the homeostatic system of the human body, it can be understood that the blood pressure of the couple decreased after they entered the hot tub. Now, the homeostatic system has its limits and can function properly only within a certain range of temperatures. Beyond this range, the temperature can be extreme for the human body and the homeostatic system will fail to adjust the blood pressure to help the body function properly. This will result in the failure of the functioning of different parts of the human body like the pulmonary system, the circulatory system, the kidneys, etc. The heat in the hot tub causes the opening of pores of the body and sweating. A huge amount of salt and water get excreated from the body through sweat in order lower the pressure. This causes dehydration and can lead to malfunctioning of different body parts.