symptoms is not typical for a decompression sickness:a Creepsb red outc chokesd bends14id 6274The following statements are true excepta poor circulation is called hypoxic hypoxiab reduced oxygen carrying capacity is called hypemic hypoxiac reduced alveolar oxygen exchange is called hypoxic hypoxiad inability of the tissue to use oxygen is called histotoxic hypoxia15id 6275The following situations can lead to stagnant hypoxiaa reduced number of healthy red blood cellsb excessive G forcesc reduced partial oxygen pressure due to high altituded alcohol or drugs16id 6276Smoking can cause hypoxia due to an increase in carbon monoxide. This is calledaa hypoxic hypoxiab stagnant hypoxiac histotoxic hypoxiad hypemic hypoxia1740.1. Human Factors: basic concepts 2002/12/22 Page 4 of 139id 6277Stages of performance decrements due to hypoxic hypoxia area disturbance threshold at 6'000 ft, critical threshold at 22'000 ftb reaction threshold at 6'000 ft, disturbance threshold at 22'000 ftc indifferent stage up to 6'000 ft, disturbance threshold at 12'000 ftd critical threshold at 12'000 ft, disturbance stage above 22'000 ft18id 6278The most dangerous sign of hypoxic hypoxia isa impaired judgment and self criticismb decreased heart ratec increased respiration rated bluish skin19id 6279TUC at 25'000 ft at rest is abouta 45 secondsb 90 secondsc 4 minutesd 10 minutes20id 6281A common phenomenon of hypoxia and hyperventilation isa impaired judgment and self criticismb shortness of breathc hypotension of the musclesd tingling sensation of arms and legs21id 6282The following statement about respiration is truea external respiration serves for the gas exchange between blood and tissue cellsb internal respiration serves for the gas exchange between environment and bloodc transport of carbon dioxide in the blood is made by combination with hemoglobind transport of oxygen in the blood is made by combination with hemoglobin22id 6283Oxygen is transported through the walls of the alveoli according toa Henry's lawb the Diffusion lawc Dalton's lawd Boyle's law23id 6284A healthy young subject should have the following lung volumesa an inspiratory reserve volume of ~0.5 literb an expiratory reserve volume of ~0.5 literc a residual volume of 1.2 literd a vital capacity of ~7.0 liter2440.1. Human Factors: basic concepts 2002/12/22 Page 5 of 139id 6285Usually, the body has a remarkable store of the following gasesa carbon dioxideb oxygenc carbon monoxided argon25id 6286The respiratory control center is primarily sensitive toa carbon dioxideb carbon monoxidec oxygend argon26id 6287Ventilation is primarily stimulated bya an increase of carbon monoxideb a decrease of oxygenc an increase of carbon dioxided a decrease of argon27id 6288The following statement is truea increased carbon dioxide causes shortness of breathb decreased oxygen causes shortness of breathc increased carbon dioxide remains unnoticedd increased oxygen causes shortness of breath28id 6289The partial pressure of the respiratory gases within the pulmonary alveoli isa 40 mmHg pCO2, 47 mmHg pH2O, 100 mmHg O2b 47 mmHg pH2O, 150 mmHg O2, 0.03 mmHg pCO2c 46 mmHg pCO2, 47 mmHg pH2O, 40 mmHg O2d 5 mmHg pCO2, 10 mmHg pH2O, 150 mmHg O229id 6290Signs or symptoms of hyperventilation area increased rate and depth of respirationb muscle twitching and tightnessc breathlessness, feelings of suffocationd all above mentioned signs or symptoms30id 6291The problems of hyperventilation are caused bya increased inhaling of oxygenb increased exhaling of carbon dioxidec decreased exhaling of carbon dioxided decreased inhaling of oxygen3140.1. Human Factors: basic concepts 2002/12/22 Page 6 of 139id 6292The following maneuvers may be used to treat a hyperventilation excepta slowing the breathing rateb increasing rate and depth of breathingc talking aloud