题目内容
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A、quantity of hemoglobin in the blood.
B、pH value
C、concentration of 2,3-DPG
D、PCO2
E、PO2
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更多“The oxygen capacity of hemoglobin is dependent on”相关的问题
A、pH value
B、concentration of 2,3-DPG
C、PCO2
D、PO2
E、quantity of hemoglobin in the blood.
A、demonstrate the relationship between PO2 and oxygen saturation in blood.
B、demonstrate the relationship between PO2 and oxygen capacity in blood.
C、demonstrate the relationship between PO2 and oxygen content in blood.
D、demonstrate the relationship between PO2 and pH value in blood.
A、demonstrate the relationship between PO2 and oxygen capacity in blood.
B、demonstrate the relationship between PO2 and oxygen content in blood.
C、demonstrate the relationship between PO2 and oxygen saturation in blood.
D、demonstrate the relationship between PO2 and pH value in blood.
A、A decrease in airway resistance
B、A decrease in diffusing capacity of the lung
C、A decrease in lung compliance
D、An increase in rate of respiration
A．smoking reduces the oxygen carrying capacity of his blood
B．smoking and drinking make him malnourished
C．the problem of deficient oxygen supply and malnourishment act synergistically
D．it's the normal metabolism
A、脱除天然气中的水蒸气、氧、硫化物、二氧化碳等组分，减少管内腐蚀Remove water vapor, oxygen, sulfide, carbon dioxide and other components from natural gas, and reduce corrosion inside tube；
B、采用管内壁防腐涂尘，保护管材The inner wall of the pipe is used for anti-corrosion and dust coating to protect the pipe material；
C、定期清管和扫线Regularly pigging and sweeping；
D、在允许的情况下，采用所能达到的最低流速输气，减少气流冲击腐蚀和携尘能力To minimize shock corrosion and dust carrying capacity, the lowest possible flow velocity is used when permitted；
E、在集气站、配气站、调压计量站等处安设分离器、除尘器和过滤器，脱除各类固（液）体杂质Separators, precipitators and filters are installed in gas collecting stations, gas distribution stations and pressure regulating and measuring stations to remove all kinds of solid (liquid) body impurities。
Walking—like swimming, bicycling and running—is an aerobic exercise, (1) builds the capacity for energy output and physical endurance by increasing the supply of oxygen to skin and muscles. Such exercises may be a primary factor in the (2) of heart and circulatory disease.
As probably the least strenuous, safest aerobic activity, walking is the (3)acceptable exercise for the largest number of people. Walking (4) comfortable speed improves the efficiency of the cardio respiratory system (5) stimulating the lungs and heart, but at a more gradual rate (6) most other forms of exercise.
In one test, a group of men 40 to 57 years of age, (7) at a fast pace for 40 minutes four days a week, showed improvement (8) to men the same age on a 30 minute, three-day-a-week jogging program in the same period. Their resting heart rate and body fat decreased (9) . These changes suggest (10) of the important—even vital—benefits walking can (11) about.
Walking (12) burns calories. It takes 3,500 calories to gain or (13) one pound. Since a one-hour walk at a moderate pace will (14) up 300 to 360 calories. By walking one hour every other day, you can burn up a-pound-and-a-half monthly, or 18 pounds (15) —providing there is no change in your intake of food. To (16) weight faster, walk an hour every day and burn up 3 pounds a month, or 36 pounds a year.
(17) your age, right now is the time to give your physical well being as much thought as you (18) to pensions or insurance. Walking is a vital defense (19) the ravages of degenerative diseases and aging. It is nature&39;s (20) of giving you a tuneup.
Blood doping, in short, means withdrawal of one unit of a little more of blood from an athlete's system about four to six weeks before a competition. The blood is then stored in a frozen state while the body replenished the lost blood through natural processes. The extracted blood is unfrozen and then pumped back into the athlete's system just before the competition. This increases the body's hemoglobin count, hereby increasing the capacity for oxygen delivery and raising the level of endurance.
A recent colloquium on the ethics of blood doping, summarized in The Physician and Sports Medicine, cited eases of runners getting blood transfusions so they could run fast enough to qualify for Boston Marathon and of blood doping in dog and horse racing.
Blood doping may be surprisingly common among world-class endurance athletes, especially cyclists and runners. Blood doping is cheating and it is now banned by the International Olympic Committee, but it is still impossible to test, and till sure checks are found, one can only count on the personal ethics of the sportspersons concerned.
Does blood doping really work？ Buick et al. and Williams et al. have made some studies in the laboratory. In one study, 11 highly trained male track athletes underwent extensive treadmill testing before and alter phlebotomy with re-infusion of 900mi of antilogous freeze-preserved red cells. The blood doping increased the mean hemoglobin concentration 8% (from 15.1% to 16.3% gnm/100ml) , maximal oxygen consumption 5% , and running time to exhaustion 35%. In another study, 12 experienced male distance runners who received 920ml of antilogous blood had a mean 7% increase in hemoglobin concentration and a mean 45-second improvement in time on a 5-mile treadmill run, compared with results after they received 920m1 saline. In the third study, 9 male college students who received two units antilogous blood had a significant increase in hemoglobin concentration and maximal oxygen consumption on a cycle ergo-meter.
It is reasonable to conclude that blood doping does work when properly performed in the laboratory. But does it work in the field？
The problem in determining if blood doping works in the field is that almost all the reports are anecdotal. Whether it works or not, blood doping as it was done for the U.S. Olympic cyclists is to be condemned. Three of the cyclists developed flu-like symptoms 36 hours after transfusion, and one of them, when asked about blood doping, said, "Yeah, I did it. I got sick and it ruined me for the Olympics." To be sure, some of the cyclists who blood-doped won medals, but so did some who refused blood doping. Likewise, not all Olympians who admitted to blood doping were medal winners: an Italian runner who blood-doped for the marathon said he ran poorly and the national cross-country team alleged to have blood-doped ran poorly. In short, one cannot tell from anecdotal reports whether or not blood doping works in the field.
Which of the following statements best expresses the main idea of the passage？
A．Blood doping does afford athletes a competitive advantage though it is not quite safe.
B．Blood doping works in the laboratory, but there is no evidence to show it works in the field.
C．Blood doping is becoming increasingly common in the world of sports.
D．Athletes who Blood-dope for endurance can perform. better than others.
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