For gas exchange to be most efficient, the respiratory membrane must be ______.
ID: 91924 • Letter: F
Question
For gas exchange to be most efficient, the respiratory membrane must be ______. a. at least 3 mu m thick b. 0.5 - 1.0 micrometers thick c. between 5 and 6 mu m thick d. less than 0.5 nanometers thick e. the thickness of the respiratory membrane is not important in the efficiency of gas exchange Which of the following statements are CORRECT? 1. "Dead-Air" space is nothing more than the volume of air in the conducting zone. 2. Residual Volume high in O_2 and very low in CO_2. 3. Inspired air mixes with RV air and changes its composition significantly. 4. Pressure gradient for movement/exchange of CO_2 usually is more than 5 mmHg. 5. After hyperventilation, more CO_2 is removed than normal and breathing temporarily ceases. 6. At the level of the alveoli, most of the 760 mmHg pressure is due to O_2. a. 1, 3, 5 b. 2, 4, 6 c. 1, 2, 4, 6 d. 1, 3, 4, 5 e. 1, 2, 3, 4, 5, 6 Consider the following chemical reaction: CO_2 + H_2 O A + B. What are species "A" andExplanation / Answer
98) The correct answer is option (b).
The exchange of gases depends on the three factors, partial pressure of the gases, thickness of the respiratory membrane and the total surface area of the respiratory membrane. An increase in the respiratory membrane thickness may decrease the rate of gas exchange. The respiratory membrane must be very thin for efficient gas exchange through the respiratory surface.
99) The correct answer is option (e).
All the given statements are true.
Dead space is the amount of air present in the conducting airways that is not involved in the gas exchange. A normal person has an ~150 ml anatomic dead space.
Residual volume is the volume of air left after a forceful expiration. During expiration, lungs removes a large amount of carbon dioxide. Therefore, after a forceful expiration, there will be less CO2 and high O2 amount.
Some air is always present in the lungs. During inspiration, the inspired air reaches to the lungs and gets mixed with the already present air and thereby, the composition of the inspired air get changed.
The pressure gradient for the exchange of CO2 is usually not more than 5 mmHg because carbon dioxide is readily soluble in the blood. Hence it does not require a high driving pressure.
Hyperventilation refers to overbreathing. During hyperventilation, more amount of carbon dioxide is removed from the blood as compared to that of produced by the body. In order to compensate, the breathing temporarily ceased.
100) The correct answer is option (c).
The bicarbonate buffer system maintains the acid-base balance of the body by maintaining the pH of blood and other body tissues. The carbonic acid produced by the reaction of carbon dioxide and water is not very stable and therefore dissociates into a proton and bicarbonate ion
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