Which of the following best describes the gas exchange that occurs in the lungs?    A. carbon dioxide diffuses into the capillaries from the alveoli  B. oxygen diffuses from the capillaries into the alveoli  C. carbon dioxide diffuses from the capillaries into the alveoli  D. oxygen diffuse into the alveoli from the capillaries

Which of the following is the primary method by which carbon dioxide is transported to the lungs? a. Dissolved in plasma b. Bound to hemoglobin c. As carbon monoxide d. As bicarbonate

During respiration, oxygen is inhaled through the airways into the alveoli where gas exchange occurs. For each condition described below, state if the flux of oxygen through the blood gas barrier into the pulmonary capillaries increases or decreases. Use Fick’s law to justify your answer. a. Climbing to the top of Mt. Everest b. More abundant but smaller alveoli c. Extreme increase in pulmonary capillary pressure d. Pulmonary fibrosis