Which body cavity contains the heart and lungs?

The thoracic cavity is the correct answer because it houses critical organs involved in respiration and circulation, specifically the heart and lungs. This cavity is located within the ribcage and is separated from the abdominal cavity by the diaphragm. The heart is situated in a space called the mediastinum, which is within the thoracic cavity, while the lungs are positioned laterally on either side of the heart. Understanding the anatomical location of these organs is crucial for grasping how the circulatory and respiratory systems function in the body.

In contrast, the cranial cavity contains the brain and other structures of the head, the abdominal cavity houses organs related to digestion, and the pelvic cavity contains structures related to the reproductive and urinary systems. Each of these cavities has distinct functions and organ systems, which is why the thoracic cavity is specifically the area relevant to the heart and lungs.