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Breathing mechanics

Thus, these giant redox metallodendrimers exhibit a breathing mechanism controlled by the redox potential. [Pg.90]

If respiratory movement ceases (e.g. due to electric shock damaging the breathing mechanism) artificial respiration is needed at once. This may be carried out by breathing into the casualty s mouth (mouth to mouth resuscitation) or by exerting pressure on the casualty s chest, thereby forcing air... [Pg.437]

The use of haemoglobin to provide a reserve of oxygen can be observed during periods of suspension of the breathing mechanism. In an Invertebrate... [Pg.321]

Respiratory failure following exposure to toxic chemical agents has two causes. The first is the failure of oxygen to be able to difluse across the walls of the alveoli into the pulmonary capillaries and thus into the arteries and cells. The second is the failure of the breathing mechanism to move gas in and out of the lungs leading to a build-up of carbon dioxide in the alveoli. These conditions are known as types 1 and 2 respiratory failure. It should be noted that type 2 respiratory failure has a shorter latency that type 1. [Pg.106]

Because of the delay in decomposition of the peroxide, oxygen evolution follows carbon dioxide sorption. A catalyst is required to obtain total decomposition of the peroxides 2 wt % nickel sulfate often is used. The temperature of the bed is the controlling variable 204°C is required to produce the best decomposition rates (18). The reaction mechanism for sodium peroxide is the same as for lithium peroxide, ie, both carbon dioxide and moisture are required to generate oxygen. Sodium peroxide has been used extensively in breathing apparatus. [Pg.487]

These mechanisms can be observed in many common situations. For example, fog via mixing can be seen in the discharge of breath on a cold day. Fog via adiabatic expansion can be seen in the low-pressure area over the wing of an airplane landing on a humid summer day and fog via condensation can be seen in the exhaust from an automobile air conditioner (if you follow closely enough behind another car to pick up the ions or NO molecules needed for nucleation). All of these occur at a veiy low supersaturation and appear to be keyed to an abundance of foreign nuclei. All of these fogs also quickly dissipate as heat or unsaturated gas is added. [Pg.1414]

The isolation of certain mechanical equipment, e.g. conveyors, work on lifts, excavations, entry and positioning of cranes, isolation of various safety services , e.g. water or inert gas, stand-by power generation, water supply to sprinkler systems, compressed air for breathing apparatus. [Pg.419]

Horsfield, K. (1986). Morphometry of airways. In The respiratory system Section 3. Mechanics of Breathing, Part 1vol. Ill (P.T. Macklem and J. Mead, Eds.), pp. 75-88. American Physio logical Society, Bethesda, Maryland. [Pg.229]

Inhaled gaseous compounds are absorbed in all parts of the respiratory system whereas particle size determines how deep into the airways the parti cles will he transported in the airstrearn. Shortness of breath is a typical sign of a chemical exposure that has affected the lungs, and it may be evoked through iminunological mechanisms (e.g., formaldehyde, ethyleneoxide), or through toxic irritation (formaldehyde, isocyanates, sulfur dioxide, nitrogen dioxide, Frequently the mechanism depends on the concentration ol the com... [Pg.294]

Not only 02 molecules but also other groups can be bound to the iron atom of hemoglobin. Specifically, carbon monoxide molecules can be so attached and, in fact, CO is more firmly bound to hemoglobin than is O2. This is one detail of the carbon monoxide poisoning mechanism. If we breathe a mixture of CO and 02 molecules, the CO molecules are preferentially picked up by the red blood cells. Since the sites... [Pg.398]

The body maintains blood pH by two primary mechanisms respiration and excretion. Carbonic acid concentration is controlled by respiration as we exhale, we deplete our system of CO, and hence deplete it of H2C03, too. This decrease in acid concentration raises the blood pH. Breathing faster and more deeply increases the amount of C02 exhaled and hence decreases the carbonic acid concentration in the blood, which in turn raises the blood pH. Hydrogen carbonate ion concentration is controlled by its rate of excretion in urine. [Pg.573]

Respiratory acidosis results when decreased respiration raises the concentration of C02 in the blood. Asthma, pneumonia, emphysema, or inhaling smoke can all cause respiratory acidosis. So can any condition that reduces a person s ability to breathe. Respiratory acidosis is usually treated with a mechanical ventilator, to assist the victim s breathing. The improved exhalation increases the excretion of C02 and raises blood pH. In many cases of asthma, chemicals can facilitate respiration by opening constricted bronchial passages. [Pg.573]


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See also in sourсe #XX -- [ Pg.243 , Pg.244 , Pg.245 ]




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