Physiology Questions 20-27. Please answer QUESTIONS 20-27 At the end of normal e
ID: 181137 • Letter: P
Question
Physiology Questions 20-27. Please answer QUESTIONS 20-27
At the end of normal expiration, when outward air flow ceases: intra-alveolar pressure is less than atmospheric pressure intra-alveolar pressure is equal to atmospheric pressure intra-alveolar pressure is greater than atmospheric pressure Which of the following areas of the brain is believed to be the location of the "pacemaker" for breathing? DRG hypothalamus pneumotaxic center pons medulla Compare the chants in percent hemoglobin saturation that would occur in the two following situations: The blood P_o_2 drops from 100 mm Hg to 80 mm Hg. The blood P_o_2 drops from 40 mm Hg to 20 mm Hg. In both situations, the percent hemoglobin saturation would decrease by 20%. There would be a large reduction in percent hemoglobin saturation in situation I but very little reduction in situation II. There would be very little reduction in percent hemoglobin saturation in situation I but a large reduction in situation II. In both situations, the percent hemoglobin saturation would increase. Which of the following statements about hemoglobin is NOT true? The plateau portion of the oxygen-hemoglobin curve is in the blood P_o_2 range that exists in the lungs. Hemoglobin removes dissolved oxygen from the Mood, thereby keeping Pc low and allowing net diffusion of oxygen from the airways to continue until the hemoglobin is dose to saturated. Hemoglobin holds onto more O_2 in the presence of carbon dioxide. Hemoglobin is found only in red blood cells. A person has a fever. How would % Hb saturation be affected? The O_2-Hb curve would shift to the left, and there would be more unloading of oxygen. The O_2-Hb curve would shift to the left, and there would be less unloading of oxygen. The O_2-Hb curve would shift to the right, and there would be more unloading of oxygen. The O_2-Hb curve would shift to the right, and there would be less unloading of oxygen. Which of the following is FALSE of carbonic anhydrase? It plays a role in bow carbon dioxide is transported, It is found in red blood cells, It is involved in the renal processing of sodium, It is involved in how ventilation is controlled, more than one of the above applies A rapid ascent to high altitude would lead to ventilation changes that initially cause: respiratory acidosis respiratory alkalosis Which of the following would decrease glomerular filtration rate? a decrease in plasma protein concentration a kidney stone in the renal tubule which causes the pressure in Bowman s capsule to increase an increase in the size of the pores in the glomerular capillary walls more than one answer is correctExplanation / Answer
20. The answer is: c. intra-alveolar pressure is equal to atmospheric pressure
At the end of a normal expiration when outward air flow has ceased, intra-alveolar pressure is equal to atmospheric pressure.
24. The answer is: c. The O2-Hb curve would shift to the right, and there would be more unloading of oxygen.
When a person has a fever, the O2-Hb curve would shift to the right, and there would be more unloading of oxygen.
26. The answer is: b. respiratory alkalosis.
A rapid ascent to high altitude would lead to ventilation changes that initially cause respiratory alkalosis.