What air movement technique is used to expel urine and feces?

The Valsalva maneuver is the correct choice for expelling urine and feces because it involves a specific technique of forced exhalation against a closed airway. This process increases intra-abdominal pressure, which is beneficial during the expulsion of substances from the body, such as urine from the bladder or feces from the rectum. During this maneuver, when a person closes their mouth, pinches their nose, and exhales forcefully, the pressure generated within the abdominal cavity helps facilitate the emptying of the bladder and the bowels.

The other options are less suitable for this purpose. Sneeze and cough primarily serve respiratory functions—sneezing helps to expel irritants from the nasal passage, while coughing clears the airways of mucus and other obstructions. Diaphragmatic breathing, on the other hand, is more focused on maximizing oxygen intake and facilitating relaxation rather than generating the necessary pressure for elimination.