Indicate whether each of the following statements is correct or incorrect.Group of answer choicesthe diffusion rate is decreased in conditions that thicken the alveolar capillary membrane[ Choose ]diffusion defects are identified by decrease in oxygenation during exercise as compared to at rest[ Choose ]capillary transit time increases with exercise[ Choose ]increasing the FIO2 would reduce hypoxemia due to a diffusion defect[ Choose ]
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" - This statement is correct. Thicker membranes impede the diffusion of gases, leading to a decreased diffusion rate. Show more…
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Question 42 An endurance athlete who is looking to improve her cardiorespiratory fitness by optimizing her training also starts taking a drug that inhibits PGC-1α activity, will likely... A. experience a dramatic shift of slow twitch fibers to fast twitch fibers. B. compromise improvements in maximal oxygen uptake. C. compromise improvements in fat oxidation. D. optimize the decrease of the oxygen deficit at the onset of exercise by taking the drug. E. Only B and C are correct. Question 38 Which of the following statements is NOT TRUE regarding the oxygen-hemoglobin dissociation curve? The curve shifts to the right during exercise due to a decrease in pH. The curve shifts to the right during exercise due to an increase in temperature. The curve shifts to the left during exercise at altitude. The steep portion of the curve represents a condition where small decreases in PO2 result in rapid offloading of O2 from hemoglobin, which occurs at the tissues. The curve for oxygen-myoglobin dissociation looks different from this curve because myoglobin’s affinity for O2 is greater than hemoglobin. Question 31 Improvements in VO2max within the first week of training can be mostly attributed to an increase in... A. a-v O2 difference. B. mitochondrial density. C. heart rate. D. plasma volume. Question 29 Which is true concerning the partial pressure for oxygen (PO2)? A. Is highest in systemic arteries. B. Is reduced by half in the heart. C. Is lowest in the lungs after inspiration. D. Is lowest in the tissues. E. None of the above are true. Question 30 Which of the following is not a reason stroke volume increases with acute exercise or exercise training? A. Increase preload (EDV). B. Increase plasma volume. C. Increase venous return. D. Increase muscle blood flow. E. Increase afterload or peripheral resistance.
Madhur L.
Select the incorrect statement from the following: (a) Diffusion of $\mathrm{O}_{2}$ occurs from alveoli to tissue. (b) Diffusion of $\mathrm{CO}_{2}$ occurs from tissue to alveoli. (c) Amount of $\mathrm{CO}_{2}$ diffused through membrane is higher than that of $\mathrm{O}_{2}$. (d) Partial pressure of $\mathrm{O}_{2}$ is higher in pulmonary artery than that of pulmonary vein.
58) Which statement accurately describes alveolar exchange of oxygen? A) Oxygen diffuses from the blood to the alveolus because the alveolus has a lower partial pressure of oxygen. B) Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen. C) Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen. D) Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen. 59) As blood travels through a systemic capillary and exchanges gases with systemic cells, A) the partial pressure of oxygen in blood increases as it goes from arterioles to venules. B) the partial pressure of oxygen on blood remains the same as it goes from arterioles to venules. C) the partial pressure of oxygen in blood decreases as it goes from arterioles to venules. 60) Which reaction involving CO2 predominates within erythrocytes in the pulmonary capillaries of the lung? A) CO2 combines with water to form bicarbonate ion and carbonic acid. B) HCO-3 dissociates into H+, CO, and O2. C) CO2 combines with H+ to form HCO2. D) HCO-3 combines with H+ to form H2CO3, which dissociates into CO2 and H2O. 61) About 70% of the CO2 that diffuses into systemic capillaries A) combines with water to form carbonic acid, which then dissociates into bicarbonate and hydrogen ions. B) forms carbonic anhydrase, which combines carbonic acid and water to solubilize the CO2. C) directly dissolves in the plasma. D) binds to hemoglobin. 62) Airway obstruction can lead to hypoventilation, which can cause A) hypocapnia and respiratory acidosis. B) hypoxia and respiratory alkalosis. C) hypocapnia and respiratory alkalosis. D) hypoxia and respiratory acidosis. E) hypocapnia and hyperpnea.
Matthew S.
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