CHAPTER 5 RESPIRATION MCO (Please select the single best answer) A1型题 1.On the summit of Mt.Everest,where the barometric pressure is about 250 mm Hg,the partial pressure of 02 is about A.0.1 mm Hg B.0.5 mm Hg C.5 mm Hg D.50 mm Hg E.100 mm Hg [答案]D 2.The approximate amount of gas left in the lungs after maximal forced expiration in a normal woman is A.zero B.0.1L C.1.1L D.3.1L E.4.2L [答案]C 3.The tidal volume in a normal man rest is about A.0.5L B.1.2L C.2.5L
CHAPTER 5 RESPIRATION MCO (Please select the single best answer) A1 型题 1. On the summit of Mt. Everest, where the barometric pressure is about 250 mm Hg, the partial pressure of O2 is about A. 0.1 mm Hg B. 0.5 mm Hg C. 5 mm Hg D. 50 mm Hg E. 100 mm Hg [答案] D 2. The approximate amount of gas left in the lungs after maximal forced expiration in a normal woman is A. zero B. 0.1 L C. 1.1 L D. 3.1 L E. 4.2 L [答案] C 3. The tidal volume in a normal man rest is about A. 0.5 L B. 1.2 L C. 2.5 L
D.4.9L E.6.0L [答案]A 4.What is the approximate dead space of a normal 70-kg man breathing through a tube that has a radius of 5 mm and a length of 100 cm? A.150 mL B.180 mL C.230 mL D.380 mL E.350 mL [答案]C 5.Which of the following is responsible for the movement of 02 from the alveoli into the blood in the pulmonary capillaries? A.Active transport B.Filtration C.Secondary active transport D.Facilitated diffusion E.Passive diffusion [答案]E 6.Which of the following causes relaxation of bronchial smooth muscle? A.Leukotrienes B. Vasoactive intestinal polypeptide (VIP) C.Acetylcholine D.Cool air
D. 4.9 L E. 6.0 L [答案] A 4. What is the approximate dead space of a normal 70-kg man breathing through a tube that has a radius of 5 mm and a length of 100 cm? A. 150 mL B. 180 mL C. 230 mL D. 380 mL E. 350 mL [答案] C 5. Which of the following is responsible for the movement of O2 from the alveoli into the blood in the pulmonary capillaries? A. Active transport B. Filtration C. Secondary active transport D. Facilitated diffusion E. Passive diffusion [答案] E 6. Which of the following causes relaxation of bronchial smooth muscle? A. Leukotrienes B. Vasoactive intestinal polypeptide (VIP) C. Acetylcholine D. Cool air
E.Sulfur dioxide [答案]B 7.Airway resistance A.is increased if the lungs are removed and inflated with saline B.does not affect the work of breathing C.is increased in paraplegic patients D.is increased in asthma E.makes up 80%of the work of breathing [答案]D 8.Most of the C02 transported in the blood is A.dissolved in plasma B.in carbamino compounds formed from plasma proteins C.in carbamino compounds formed from hemoglobin D.bound to Cl- E.in HC03- [答案]E 9.Which of the following has the greatest effect on the ability of blood to transport oxygen? A.Capacity of the blood to dissolve oxygen B.Amount of hemoglobin in the blood C.pH of plasma D.C02 content of red blood cells E.Temperature of the blood [答案]B
E. Sulfur dioxide [答案] B 7. Airway resistance A. is increased if the lungs are removed and inflated with saline B. does not affect the work of breathing C. is increased in paraplegic patients D. is increased in asthma E. makes up 80% of the work of breathing [答案] D 8. Most of the CO2 transported in the blood is A. dissolved in plasma B. in carbamino compounds formed from plasma proteins C. in carbamino compounds formed from hemoglobin D. bound to Cl- E. in HCO3- [答案] E 9. Which of the following has the greatest effect on the ability of blood to transport oxygen? A. Capacity of the blood to dissolve oxygen B. Amount of hemoglobin in the blood C. pH of plasma D. CO2 content of red blood cells E. Temperature of the blood [答案] B
10.The main respiratory control neurons A.send out regular bursts of impulses to expiratory muscles during quiet respiration B.are unaffected by stimulation of pain receptors C.are located in the pons D.send out regular bursts of impulses to inspiratory muscles during quiet respiratory E.are unaffected by impulses from the cerebral cortex [答案]D 11.Intravenous lactic acid increases ventilation.The receptors responsible for this effect are located in the A.medulla oblongata B.carotid bodies C.lung parenchyma D.aortic baroreceptors E.trachea and large bronchi [答案]B 12. Spontaneous respiration ceases after A.transection of the brain stem above the pons B.transection of the brain stem at the caudal end of the medulla C.bilateral vagotomy D.bilateral vagotomy combined with transection of the brain stem at the superior border of the pons E.transection of the spinal cord at the level of the first thoracic segment
10. The main respiratory control neurons A. send out regular bursts of impulses to expiratory muscles during quiet respiration B. are unaffected by stimulation of pain receptors C. are located in the pons D. send out regular bursts of impulses to inspiratory muscles during quiet respiratory E. are unaffected by impulses from the cerebral cortex [答案] D 11. Intravenous lactic acid increases ventilation. The receptors responsible for this effect are located in the A. medulla oblongata B. carotid bodies C. lung parenchyma D. aortic baroreceptors E. trachea and large bronchi [答案] B 12. Spontaneous respiration ceases after A. transection of the brain stem above the pons B. transection of the brain stem at the caudal end of the medulla C. bilateral vagotomy D. bilateral vagotomy combined with transection of the brain stem at the superior border of the pons E. transection of the spinal cord at the level of the first thoracic segment
[答案]B 13.Stimulation of the central (proximal)end of a cut vagus nerve would be expected to A.increase heart rate B.stimulate inspiration C.inhibit coughing D.raise blood pressure E.cause apnea [答案]E 14.Injection of a drug that stimulates the carotid bodies would be expected to cause A.a decrease in the pH of arterial blood B.a decrease in the Pco2 of arterial blood C.an increase in the HC03-concentration of arterial blood D.an increase in urinary Na+excretion E.an increase in plasma Cl- [答案]B 15.Variations in which of the following components of blood or cerebrospinal fluid do not affect respiration? A.Arterial HC03-concentration B.Arterial H+concentration C.Arterial Na+concentration D.Cerebrospinal fluid C02 concentration E.Cerebrospinal fluid H+concentration
[答案] B 13. Stimulation of the central (proximal) end of a cut vagus nerve would be expected to A. increase heart rate B. stimulate inspiration C. inhibit coughing D. raise blood pressure E. cause apnea [答案] E 14. Injection of a drug that stimulates the carotid bodies would be expected to cause A. a decrease in the pH of arterial blood B. a decrease in the Pco2 of arterial blood C. an increase in the HCO3- concentration of arterial blood D. an increase in urinary Na+ excretion E. an increase in plasma Cl- [答案] B 15. Variations in which of the following components of blood or cerebrospinal fluid do not affect respiration? A. Arterial HCO3- concentration B. Arterial H+ concentration C. Arterial Na+ concentration D. Cerebrospinal fluid CO2 concentration E. Cerebrospinal fluid H+ concentration
[答案]C 16. In which of the following conditions is C02 retention most likely to occur? A.Climbing a high mountain B.Ventilator failure C.Carbon monoxide poisoning D.Lung failure E.Hysterical hyperventilation [答案]B 17.Pulmonary fibrosis would be expected to produce A.histotoxic hypoxia B.stagnant hypoxia C.decreased vital capacity D.cyanosis E.emphysema [答案]D 18.Which of the following deleterious effects would probably not be produced by chronic cigarette smoking? A.Patches of atelectasis B.Myocardial ischemia C.Loss of elastic tissue in the lung D.Increased anatomic dead space E.Increased carbonmonoxyhemoglobin in blood [答案]D
[答案] C 16. In which of the following conditions is CO2 retention most likely to occur? A. Climbing a high mountain B. Ventilator failure C. Carbon monoxide poisoning D. Lung failure E. Hysterical hyperventilation [答案] B 17. Pulmonary fibrosis would be expected to produce A. histotoxic hypoxia B. stagnant hypoxia C. decreased vital capacity D. cyanosis E. emphysema [答案] D 18. Which of the following deleterious effects would probably not be produced by chronic cigarette smoking? A. Patches of atelectasis B. Myocardial ischemia C. Loss of elastic tissue in the lung D. Increased anatomic dead space E. Increased carbonmonoxyhemoglobin in blood [答案] D
19.02 delivery to the tissues would be reduced to the greatest extent in A.a normal subject breathing 100%02 on top of Mt.Everest B.a normal subject running a marathon at sea level C.a patient with carbon monoxide poisoning D.a patient who has ingested cyanide E.a patient with moderately severe metabolic acidosis [答案]C 20.Which of the following is not a manifestation of oxygen toxicity? A.Irritation of the respiratory tract B.Difficulty in seeing because of retrolental fibroplasia C.Convulsions D.Lung cysts in infants E.Rapture of the deep [答案]E
19. O2 delivery to the tissues would be reduced to the greatest extent in A. a normal subject breathing 100% O2 on top of Mt. Everest B. a normal subject running a marathon at sea level C. a patient with carbon monoxide poisoning D. a patient who has ingested cyanide E. a patient with moderately severe metabolic acidosis [答案] C 20. Which of the following is not a manifestation of oxygen toxicity? A. Irritation of the respiratory tract B. Difficulty in seeing because of retrolental fibroplasia C. Convulsions D. Lung cysts in infants E. Rapture of the deep [答案] E