Which of the following body areas is NOT influenced by the mechanical effects of trapped gases?

The heart is not influenced by the mechanical effects of trapped gases in the same way that other body areas like the ears, sinuses, and gastrointestinal (G.I.) tract are. The ears and sinuses are directly affected by changes in atmospheric pressure, which can lead to discomfort or pain due to the pressure differential across the eardrum and sinus membranes.

In the G.I. tract, trapped gases can also create expansion and discomfort, affecting the stomach and intestines. However, the heart is enclosed within the thoracic cavity and is surrounded by various structures, including the lungs and the chest wall. It does not experience the same pressure differentials caused by trapped gases because it operates through a different mechanism, specifically through the circulatory system and not through direct exposure to gas pockets or pressure changes.

Hence, the heart is less susceptible to the mechanical effects of trapped gases compared to the other areas mentioned.