53. During external respirations, gases are exchanged between the a. Outside air

Question

53. During external respirations, gases are exchanged between the a. Outside air and the alveoli b. Alveoli and the blood c. Blood and the cells d. Cytosol and the mitochondria pliance is affected primarily by the amount of elastic tissue in the lungs and the a. Amount of surfactant b· Thickness of the cartilage in the bronchiole wall c. Partial pressure of oxygen in inspired air d. Temperature of the inspired air 55. During internal respiration, oxygen moves a. Into cells by primary active transport b. Out of cells by primary active transport c. Into cells by diffusion d. Out of cells by diffusion 56. Most of the oxygen is transported in the blood in which of the following forms? a. b. c. d. Attached to the heme portion of hemoglobin Attached to the globin portion of hemoglobin Simply dissolved in the plasma Attached to plasma proteins 57. Carbonic acid is formed when a. b. c. d. Oxygen combines with the bicarbonate ion Carbon dioxide combines with the bicarbonate ions Carbon dioxide combines with water, Oxygen and carbon dioxide combine 58. Where would you expect to find the highest partial pressure of carbon dioxide? a. In the atmosphere b. In the pulmonary arteries c. In the pulmonary veins d. In alveolar air 59. The basic pattern of breathing is set by nuclei of neurons located in the a. Lungs b. Phrenic nerve c. Medulla oblongata d. Carotid bodies of the aorta PB pg. 8

Explanation / Answer

53. A. Outside air and alveoli. Internal respiration is exchange between blood and cells.

54. A. Amount of surfactant. Type II epithelial cells secrete surfactant which increases lung compliance.

55. C. Into cells by diffusion. Carbon dioxide diffused out of cell.

56. A. Attached to heme.

57. C. Carbon dioxide and water

58. B. Pulmonary artery. As it carries deoxygenated blood.

59. C. Medulla oblongata. The respiratory center is in medulla and pond in brainstem.

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