28. Which of the following influences (has an muscles during exercise? i effect

Question

28. Which of the following influences (has an muscles during exercise? i effect on) oxygen unloading at the tissues of a. The b. Body temperature C. Blood pH d. All of the above 2 Ep2 grdient between arterial blood and the exercising muscles 29, How would aerobic exercise affect % Oxyhemoglobin saturation of venous blood? a. It would be greater than 75% b. It would be less than 75% C. It would be 75% 30. Patients with chronicaly high pCO2 blood levels breathe due to would happen if a hypoxic drive. they were to breathe in 100% oxygen for a long time?? y would be happy because they would finally be able to breath anaerobic respiration. Respiratory rate would slow and eventually they would stop breathing a. The b. It woul d increase their energy because they would be able to use aerobic rather than c. drive. 31. Normal, healthy people breathe due to a a. Hypercapnic b. Hypocapnic c. Alveolar d. Hypoxic 32. Patients with pulmonary disease causing poor gas exchange at the alveoli may exhibit an increase in arterial pCo2. These patients may develop which type of primary acid-base disorder? a. Respiratory acidosis b. Respiratory alkalosis 33. Which of the following pertains to what happens when the diaphragm, external intercostal, scalene, pectoralis minor, serratus anterior and sternocleidomastoid muscles contract? This occurs during forced inhalation. VC would measure the total amount of air a. b. This occurs during forced inhalation. The sum of TV and IRV would measure the total c. This occurs during forced exhalation. ERV would measure the amount of air forcefully d. This occurs during forced exhalation. VC would measure the amount of air forcefully inspired amount of air inspired expired expired

Explanation / Answer

28. A
The difference in partial pressure of Oxygen in the blood and the muscle cause the oxygen to move out of hemoglobin. The blood pH and temperature do not play active role in this process. pO2 in blood peripheral blood is around 100mm of Hg, whereas the pO2 in muscle is around 30mm of Hg. This difference causes the oxygen to readily diffuse into muscle cells.

29. The venous oxygen is the oxygen that is left after the extraction from the muscles. During exercise, the demand for oxygen increases and the muscles extract more oxygen. This decreases the oxygen saturationin venous blood. usually the oxygen saturation of venous blood is around 60 - 80%. This will fall below that range. Hence ans is b. less than 75%.

30. The patient with high PCO2 is given 100% oxygen air to breathe. This cause the recceptors in the lungs to close due to high oxygen saturation. Eventually the breathing will cease and patient may die. Option. C

31. hypoxic drive. Low oxygen triggers the breathing.

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