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An 1831 color lithograph by Robert Seymour depicts cholera as a robed, skeletal creature emanating a deadly black cloud.. The miasma theory (also called the miasmic theory) is an abandoned medical theory that held that diseases—such as cholera, chlamydia, or the Black Death—were caused by a miasma (μίασμα, Ancient Greek for 'pollution'), a noxious form of "bad air", also known as ...
Real-time magnetic resonance imaging of the human thorax during breathing X-ray video of a female American alligator while breathing. Breathing (spiration [1] or ventilation) is the rhythmical process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen.
People who are predisposed to develop high-altitude pulmonary edema may present a reduction in urine production before respiratory symptoms become apparent. [ 15 ] Humans have survived for two years at 5,950 m (19,520 ft, 475 millibars of atmospheric pressure), which is the highest recorded permanently tolerable altitude; the highest permanent ...
When you breathe in air pollution, the particles can produce an imbalance in the body known as oxidative stress, and can cause inflammation in your lungs that triggers wheezing, shortness of ...
Poor air quality impacts more than your lungs. Despite decades of progress, a 2024 American Lung Association report found that 11.7 million more people are breathing unhealthy air compared to last ...
Recreational scuba divers commonly breathe nitrox containing up to 40% oxygen, while technical divers use pure oxygen or nitrox containing up to 80% oxygen to accelerate decompression. Divers who breathe oxygen fractions greater than of air (21%) need to be educated on the dangers of oxygen toxicity and how to manage the risk. [76]
But wildfire smoke is one the worst kinds of air pollution that people can breathe. Compared with other types of air pollution such as air quality experienced in large cities, wildfire smoke has ...
Moreover, while lowland people typically experience increased breathing for only a few days after entering high altitudes, Tibetans maintain this rapid breathing and elevated lung capacity throughout their lifetime. [36] This enables them to inhale large amounts of air per unit of time to compensate for low oxygen levels.