Which pressure type applies downward force toward the subject's sternum?

The correct choice identifies compression pressure as the type that applies a downward force toward the subject's sternum. Compression pressure is characterized by a direct and sustained force that not only affects the surface of the body but also influences underlying structures. When applied to the sternum, this pressure can be crucial in various contexts, such as medical interventions (e.g., during CPR) or in certain therapeutic practices where the goal is to stabilize or manipulate the underlying tissues effectively.

Compression pressure is distinguished from other forms of pressure like simple pressure, which may not apply the same level of focused force, and complex pressure, which typically involves multiple direction-focused forces that can differ significantly in application and effect. Understanding these differences is essential for recognizing how various pressure types interact with the body in practical situations.