31. Which of the following will increase the unloading of oxygen within the tiss

Question

31. Which of the following will increase the unloading of oxygen within the tissue? A) increased hydrogen ion concentration only B) increased Pco2 only C) increased body temperature only D) both increased hydrogen ion concentration and increased body temperature E) increased hydrogen ion concentration, increased body temperature, and increased PcO2 32. At sea level, if oxygen is consumed by the body cells at a rate of 300 mL per minute, then how much oxygen diffuses from the alveoli into the blood in the pulmonary capillaries? A) 300 mL per minute B) more than 300 mL per minute C) less than 300 mL per minute D) It depends on where the oxygen is being utilized. E) It depends on whether or not carbon dioxide is being produced at the same rate. 33. Hyperventilation decreases blood pH. A) True B) False 34. In a mixture of gases, the driving force for the movement of an individual gas within that mixture is ultimately the A) solubility of the gas. B) total pressure of the gases. C) fractional concentration of that gas. D) partial pressure of that gas. E) volume of the gas. 35. Oxygenated blood is found in which of the following? A) right atrium only B) pulmonary artery only C) pulmonary vein only D) both the right atrium and pulmonary artery E) both the right atrium and pulmonary vein 36. The chemoreceptor reflex regulates ventilation primarily through sensing changes in blood PO2- A) True B) False

Explanation / Answer

31. unloading of oxygen in tissues depend on the partial pressure of carbon dioxide (PCO2), hydrogen ion concentration and increased body temperature. These factors are required to increase the efficiency of oxidative phosphorylation of an organism to carryout cellular metabolism using oxygen and influence the unloading of oxygen into tissues. Option E is correct.

32. At sea level if oxygen consumed by cells is 300mL per amount, the amount of oxygen diffused from alveoli to blood will be the same and equals to 300mL per minute. This is because the partial pressure of O2 in lungs is lower than the atmospheric pressure and continuous O2 uptake occurs due to continuous diffusion of CO2 from pulmonary capillaries into alveoli. Option A is correct.

33. The given statement is false. This is because hyperventilation results in decreased partial pressure of arterial carbon dioxide (PaCO2).The decrease in PaCO2 causes increase of the ratio of bicarbonate concentration to PaCO2. This may result in increase of the pH level. Thus, hyperventilation is known as respiratory alkalosis.

34. Partial pressure of a gas is defined as the pressure at which the gas alone occupies a volume at constant temperature. Therefore, in a mixture of gases, partial pressure is the driving force of individual gas. The sum of partial pressures gives the ideal pressure of mixture of gases. Therefore, option D is correct.

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