In the normal individual in the upright position                                                                   ...

In the normal individual in the upright position                                                                                                  1. the negative pleural pressure is greater (i.e., more negative) in the upper lung regions.      2. the alveoli in the lower lung regions are larger than the alveoli in the upper lung regions.         3. ventilation is more effective in the lower lung regions.                                                                                          4. the pleural pressure is always below atmospheric pressure during a normal ventilatory cycle.

A. 1 and 2 only                 B. 2 and 3 only                  C. 2, 3, and 4 only            D. 1, 3, and 4 only