Which of the following is (are) true of oxygen toxicity?  I. Free radicals are produced in an abundance, leading to cell damage and death  II. Can result in physiologic shunting  III. Can be avoided by limiting 02 exposure to < 70% concentration at all times  IV. Is marked by an increased in neutrophils and macrophages, common immune responses A. I, II, III B. I, II and IV C. I, II, III and IV

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Homeostasis

Homeostasis is a self-regulatory process through which different biological systems maintain constant internal environmental conditions to compensate for environmental changes. In human physiology, it is a process of self-regulating internal, chemical, and physical conditions at an optimal level for survival. The stability through homeostasis can be attained through dynamic equilibrium, in which there is a continuous change until it reaches its systemic conditions.