Final answer:
During chest compressions in CPR, you aim for the sternum, which is the actual bone at the center of the chest. By applying pressure on the sternum, you can manually compress the blood within the heart.
Step-by-step explanation:
During chest compressions in CPR, you aim for the sternum, which is the actual bone at the center of the chest. The sternum is the elongated bony structure that anchors the anterior thoracic cage. It consists of three parts: the manubrium, body, and xiphoid process. By applying pressure with the flat portion of one hand on the sternum in the area between the line at T4 and T9, you can manually compress the blood within the heart enough to push some of the blood into the pulmonary and systemic circuits.