Question

9. The partial pressure of CO2 in the lungs changes with breathing rate. For example, a common remedy for hiccups is to hold the breath. Under these conditions, pCO2 in the lungs rises above normal a) Explain the effect of this procedure on blood pH. b) Sprinters will often hyperventilate (breathe rapidly and deeply) to remove CO2 from the lungs prior to a race. Blood pH can rise to 7.6 during this practice. Why does blood pH increase? Write the relevant equilibria for the biological buffer system involved c) During a sprint, the muscles produce a large amount of lactic acid via anaerobic metabolism of glucose. Given this information, why would hyperventilation be useful in mitigating the effects of lactic acid accumulation?

Answer 1

9. a) CO2 rises in the blood dissolved فيه ما AN = E 10, + H, 0 - Blood plasma H, 10 => H+ + H20, r CO2 THt and lowers the pH of blood. 6 Decrease in co2 lead to decreased concentration of Hi can be Eplained by above reaction of port a) therefore the Concentration lead to increased blood pH. Decreased conc. of H+ is sensed by kidney so kidney increases the reabsorption it and increased secretion. of kt. Biological buffer system that Equillibriate with I Respiratory alkalosis. e) Red Hyperventilation leads to Respiratory alklosis as CO2 Conc. dencreases and blood pH increases and lactic acid accumulation lead to acidosis so hyperventilation might compensate for metabolic acidosis. = -