7. Which of the following statements are accurate?
A. Humans bring air into their lungs by generating a positive pressure (higher pressure relative to the atmosphere)
B. When the diaphragm contracts it becomes dome-shaped and causes the lung to decrease in volume which decreases the pressure of air in the lungs.
C. In a close chamber (such as the lungs), As the volume of a gas increases the pressure decreases
D. The diaphragm is the primary breathing muscles in humans
E. In human lungs, new air mixes with air in the lungs already. This decreases the efficiency of ventilation