Calculate the PO2 of air that is made up of 21% oxygen. We are at sea level where atmospheric pressure is 760 mm Hg. Round off your answer to nearest whole number. 21 mm Hg    140 mm Hg    160 mm Hg    760 mm Hg    none of the above

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A:

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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.