In the human body, health is maintained through the interconnectedness of organ systems, proper posture, and stable biochemical metabolism.
Many different things can affect brain function, from infection, to trauma, to metabolic imbalances, but only a few of them are deadly. Most of these deadly diseases are equal opportunity, infecting just as many people from First World countries as they do from underdeveloped nations.
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Breathing can be a conscious or unconscious act. We can hold our breath or breathe deep even while the rest of our body is asleep. Without the respiratory system our body could not get the vital oxygen it needs to function. Lungs themselves are made of a soft, spongy material that contain no muscle at all.
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