What is the proper hand position for chest compressions on an adult?

The proper hand position for chest compressions on an adult is indeed in the center of the chest, specifically on the lower half of the sternum. This location is critical for effective compressions, as it allows the compressive force to be applied directly to the heart, helping to establish blood circulation during cardiac arrest.

When compressions are performed correctly in this position, it ensures that adequate pressure is maintained on the heart and that blood is pumped effectively throughout the body. The lower half of the sternum provides a stable surface to exert force without the risk of injury to vital organs or structures.

Positioning over the upper part of the sternum, near the belly button, or on the side of the chest would not provide the necessary impact to the heart, which decreases the effectiveness of the compressions and can hinder the resuscitation efforts. Thus, maintaining the correct hand placement is vital for a successful outcome in emergency situations involving cardiac arrest.