How does the mask assist in the maintenance of homeostasis?

All the systems of the human body are involved, with particular contributions by the endocrine, nervous, respiratory and renal systems. Whenever an imbalance occurs, regulatory systems become active to restore optimum conditions, usually by a process known as negative feedback in which a deviation from the normal level is detected and initiates changes that bring the level back to where it should be (Clancy and McVicar, 1995). These systems have to endure for survival and adapt to modifications of the environment so must therefore evolve.

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