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Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen (O 2) at increased partial pressures.Severe cases can result in cell damage and death, with effects most often seen in the central nervous system, lungs, and eyes.
When daylight saving time ends at 2 a.m. Sunday, millions of Americans will gain an extra hour of sleep when clocks are turned back an hour. But does the extra 60 minutes of sleep come with a cost?
The volume of air that moves in or out (at the nose or mouth) during a single breathing cycle is called the tidal volume. In a resting adult human, it is about 500 ml per breath. At the end of exhalation, the airways contain about 150 ml of alveolar air which is the first air that is breathed back into the alveoli during inhalation.
Respiratory arrest is a serious medical condition caused by apnea or respiratory dysfunction severe enough that it will not sustain the body (such as agonal breathing). Prolonged apnea refers to a patient who has stopped breathing for a long period of time. If the heart muscle contraction is intact, the condition is known as respiratory arrest.
The normal relaxed state of the lung and chest is partially empty. Further exhalation requires muscular work. Inhalation is an active process requiring work. [4] Some of this work is to overcome frictional resistance to flow, and part is used to deform elastic tissues, and is stored as potential energy, which is recovered during the passive process of exhalation, Tidal breathing is breathing ...
Sunrise alarm clocks may have different features but all work in a similar way: a light fixture in the device turns on and slowly begins brightening over the course of an interval of time until ...
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In free-running actograms, the period of activity is typically offset each day from the previous day, due to the fact that biological clocks rarely follow an exactly 24-hour cycle. If data points shift to the left, the subject is running on a cycle less than 24 hours. If they shift to the right, it is running on a greater than 24-hour cycle.