40. Oxygen and carbon dioxide are exchanged in the lungs by a) active transport

Question

40. Oxygen and carbon dioxide are exchanged in the lungs by a) active transport mechanism b) diffusion c) fáltration d) osmosis e) both a) and b) 41. What is the tidal volume if the respiratory minute volume is 4500 mL/min and the respiratory r ate is 15 a) 300 mL/breath b) 0.0033 breath/mL c) 67500 mL. breath.min d) too little information to calculate 42. The P50 is the partial pressure of O2 at which hemoglobin is 50% having a greater affinity for oxygen higher or lower? saturated with O2-is the P50 for hemoglobin a) Higher b) Lower c) The Same 3. As the partial pressure of Co, increases, the affinity of hemoglobin for oxygen a) increases b) decreases c) remains the same In the gill countercurrent gas exchange system (illustrated ), oxygen is extracted from water ) mostly by the blood entering the gills ) mostly by the blood leaving the gills equally by the blood throughout the gills by active transport across the gill lamellae by the gradient between colloidal osmotic and hydrostatic pressures b) Countercurrent gas exchange t Medium Blood nter-current flow is important in: intaining the single effect in the medulla of the vertebrate kidney. intaining a maximal oxygen extraction by the fish gill. ping the tuna's swimming muscles warmer than the surrounding water enting a duck from losing large amounts of heat through its feet to ice when weather is cold f the above are true.

Explanation / Answer

40)B. Gaeses exchange in alveoli occur by diffusion from alveolar membrane to blood capillaries.

41) A. Respiratory minute volume is the product of Tidal volume and respiratory rate per minute. So tidal volume is 4500 divided by 15 equals to 300 ml per breath.

42)C. The same

43)B. Decrease . When partial pressure of carbon dioxide increases affinity of haemoglobin to bind with oxygen decrease.

44)B. Counter current mechanism for the exchange of gases in fishes.

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